
Engineering is the use of
scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings. The discipline of engineering encompasses a broad range of more specialized
fields of engineering, each with a more specific emphasis on particular areas of
applied mathematics
Applied mathematics is the application of mathematical methods by different fields such as physics, engineering, medicine, biology, finance, business, computer science, and industry. Thus, applied mathematics is a combination of mathemat ...
,
applied science, and types of application. See
glossary of engineering.
The term ''engineering'' is derived from the
Latin
Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power ...
''ingenium'', meaning "cleverness" and ''ingeniare'', meaning "to contrive, devise".
Definition
The
American Engineers' Council for Professional Development (ECPD, the predecessor of
ABET)
has defined "engineering" as:
The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property.
(Includes Britannica article on Engineering)
History

Engineering has existed since ancient times, when humans devised inventions such as the wedge, lever, wheel and pulley, etc.
The term ''engineering'' is derived from the word ''engineer'', which itself dates back to the 14th century when an ''engine'er'' (literally, one who builds or operates a ''
siege engine'') referred to "a constructor of military engines." In this context, now obsolete, an "engine" referred to a military machine, ''i.e.'', a mechanical contraption used in war (for example, a
catapult). Notable examples of the obsolete usage which have survived to the present day are military engineering corps, ''e.g.'', the
U.S. Army Corps of Engineers.
The word "engine" itself is of even older origin, ultimately deriving from the Latin ''ingenium'' (c. 1250), meaning "innate quality, especially mental power, hence a clever invention."
Later, as the design of civilian structures, such as bridges and buildings, matured as a technical discipline, the term
civil engineering
Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewa ...
entered the lexicon as a way to distinguish between those specializing in the construction of such non-military projects and those involved in the discipline of
military engineering.
Ancient era

The
pyramids in
ancient Egypt,
ziggurats of
Mesopotamia
Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the F ...
, the
Acropolis
An acropolis was the settlement of an upper part of an ancient Greek city, especially a citadel, and frequently a hill with precipitous sides, mainly chosen for purposes of defense. The term is typically used to refer to the Acropolis of Athens, ...
and
Parthenon
The Parthenon (; grc, Παρθενών, , ; ell, Παρθενώνας, , ) is a former temple on the Athenian Acropolis, Greece, that was dedicated to the goddess Athena during the fifth century BC. Its decorative sculptures are conside ...
in Greece, the
Roman aqueduct
The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. Aqueduct water supplied public baths, latrines, fountains, and private households; it also supported min ...
s,
Via Appia
The Appian Way (Latin and Italian: ''Via Appia'') is one of the earliest and strategically most important Roman roads of the ancient republic. It connected Rome to Brindisi, in southeast Italy. Its importance is indicated by its common name, ...
and Colosseum,
Teotihuacán
Teotihuacan ( Spanish: ''Teotihuacán'') (; ) is an ancient Mesoamerican city located in a sub-valley of the Valley of Mexico, which is located in the State of Mexico, northeast of modern-day Mexico City. Teotihuacan is known today as ...
, and the
Brihadeeswarar Temple
Brihadishvara Temple, called Rajarajesvaram () by its builder, and known locally as ''Thanjai Periya Kovil'' ("Thanjavur Big Temple") and ''Peruvudaiyar Kovil'', is a Shaivite Hindu temple built in a Chola architectural style located on t ...
of
Thanjavur
Thanjavur (), also Tanjore, Pletcher 2010, p. 195 is a city in the Indian state of Tamil Nadu. Thanjavur is the 11th biggest city in Tamil Nadu. Thanjavur is an important center of South Indian religion, art, and architecture. Most of the ...
, among many others, stand as a testament to the ingenuity and skill of ancient civil and military engineers. Other monuments, no longer standing, such as the
Hanging Gardens of Babylon
The Hanging Gardens of Babylon were one of the Seven Wonders of the Ancient World listed by Hellenic culture. They were described as a remarkable feat of engineering with an ascending series of tiered gardens containing a wide variety of tre ...
and the
Pharos of Alexandria
The Lighthouse of Alexandria, sometimes called the Pharos of Alexandria (; Ancient Greek: ὁ Φάρος τῆς Ἀλεξανδρείας, contemporary Koine ), was a lighthouse built by the Ptolemaic Kingdom of Ancient Egypt, during the re ...
, were important engineering achievements of their time and were considered among the
Seven Wonders of the Ancient World
The Seven Wonders of the Ancient World, also known as the Seven Wonders of the World or simply the Seven Wonders, is a list of seven notable structures present during classical antiquity. The first known list of seven wonders dates back to the 2 ...
.
The six classic
simple machines
A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term re ...
were known in the
ancient Near East
The ancient Near East was the home of early civilizations within a region roughly corresponding to the modern Middle East: Mesopotamia (modern Iraq, southeast Turkey, southwest Iran and northeastern Syria), ancient Egypt, ancient Iran (Ela ...
. The
wedge and the
inclined plane
An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle from the vertical direction, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six cla ...
(ramp) were known since
prehistoric
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use o ...
times. The
wheel, along with the
wheel and axle mechanism, was invented in
Mesopotamia
Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the F ...
(modern Iraq) during the 5th millennium BC. The
lever mechanism first appeared around 5,000 years ago in the
Near East, where it was used in a simple
balance scale,
and to move large objects in
ancient Egyptian technology. The lever was also used in the
shadoof water-lifting device, the first
crane
Crane or cranes may refer to:
Common meanings
* Crane (bird), a large, long-necked bird
* Crane (machine), industrial machinery for lifting
** Crane (rail), a crane suited for use on railroads
People and fictional characters
* Crane (surname) ...
machine, which appeared in Mesopotamia circa 3000 BC,
and then in
ancient Egyptian technology circa 2000 BC. The earliest evidence of
pulleys date back to Mesopotamia in the early 2nd millennium BC,
and
ancient Egypt during the
Twelfth Dynasty (1991-1802 BC). The
screw, the last of the simple machines to be invented,
first appeared in Mesopotamia during the
Neo-Assyrian period (911-609) BC.
The
Egyptian pyramids
The Egyptian pyramids are ancient masonry structures located in Egypt. Sources cite at least 118 identified "Egyptian" pyramids. Approximately 80 pyramids were built within the Kingdom of Kush, now located in the modern country of Sudan. ...
were built using three of the six simple machines, the inclined plane, the wedge, and the lever, to create structures like the
Great Pyramid of Giza.
The earliest civil engineer known by name is
Imhotep.
As one of the officials of the
Pharaoh
Pharaoh (, ; Egyptian: '' pr ꜥꜣ''; cop, , Pǝrro; Biblical Hebrew: ''Parʿō'') is the vernacular term often used by modern authors for the kings of ancient Egypt who ruled as monarchs from the First Dynasty (c. 3150 BC) until th ...
,
Djosèr, he probably designed and supervised the construction of the
Pyramid of Djoser (the
Step Pyramid) at
Saqqara
Saqqara ( ar, سقارة, ), also spelled Sakkara or Saccara in English , is an Egyptian village in Giza Governorate, that contains ancient burial grounds of Egyptian royalty, serving as the necropolis for the ancient Egyptian capital, Memphi ...
in Egypt around 2630–2611 BC.
The earliest practical
water-powered machines, the
water wheel
A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel (usually constructed from wood or metal), with a number of blades or buck ...
and
watermill, first appeared in the
Persian Empire, in what are now Iraq and Iran, by the early 4th century BC.
Kush developed the
Sakia during the 4th century BC, which relied on animal power instead of human energy.
Hafirs were developed as a type of
reservoir
A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation.
Reservoirs can be created in a number of ways, including control ...
in Kush to store and contain water as well as boost irrigation.
[Fritz Hintze, Kush XI; pp.222-224.] Sappers were employed to build
causeways
A causeway is a track, road or railway on the upper point of an embankment across "a low, or wet place, or piece of water". It can be constructed of earth, masonry, wood, or concrete. One of the earliest known wooden causeways is the Sweet ...
during military campaigns. Kushite ancestors built
speos during the Bronze Age between 3700 and 3250 BC.
Bloomeries
A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides. The bloomery was the earliest form of smelter capable of smelting iron. Bloomeries produce a porous mass of iron and slag called a ''bloom''. ...
and
blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. ''Blast'' refers to the combustion air being "forced" or supplied above atmospheric p ...
s were also created during the 7th centuries BC in Kush.
Ancient Greece
Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity ( AD 600), that comprised a loose collection of cult ...
developed machines in both civilian and military domains. The
Antikythera mechanism, an early known mechanical
analog computer, and the mechanical
inventions of
Archimedes
Archimedes of Syracuse (;; ) was a Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. Although few details of his life are known, he is regarded as one of the leading scienti ...
, are examples of Greek mechanical engineering. Some of Archimedes' inventions as well as the Antikythera mechanism required sophisticated knowledge of
differential gearing or
epicyclic gearing, two key principles in machine theory that helped design the
gear trains of the Industrial Revolution, and are still widely used today in diverse fields such as
robotics
Robotics is an interdisciplinarity, interdisciplinary branch of computer science and engineering. Robotics involves design, construction, operation, and use of robots. The goal of robotics is to design machines that can help and assist human ...
and
automotive engineering.
Ancient Chinese, Greek, Roman and
Hunnic armies employed military machines and inventions such as
artillery
Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieg ...
which was developed by the Greeks around the 4th century BC, the
trireme
A trireme( ; derived from Latin: ''trirēmis'' "with three banks of oars"; cf. Greek ''triērēs'', literally "three-rower") was an ancient vessel and a type of galley that was used by the ancient maritime civilizations of the Mediterranean ...
, the
ballista
The ballista (Latin, from Greek βαλλίστρα ''ballistra'' and that from βάλλω ''ballō'', "throw"), plural ballistae, sometimes called bolt thrower, was an ancient missile weapon that launched either bolts or stones at a distant ...
and the
catapult. In the Middle Ages, the
trebuchet was developed.
Middle Ages
The earliest practical
wind-powered machines, the
windmill
A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, specifically to mill grain (gristmills), but the term is also extended to windpumps, wind turbines, and other applications, in so ...
and
wind pump, first appeared in the
Muslim world
The terms Muslim world and Islamic world commonly refer to the Islamic community, which is also known as the Ummah. This consists of all those who adhere to the religious beliefs and laws of Islam or to societies in which Islam is practiced. In ...
during the
Islamic Golden Age
The Islamic Golden Age was a period of cultural, economic, and scientific flourishing in the history of Islam, traditionally dated from the 8th century to the 14th century. This period is traditionally understood to have begun during the reign ...
, in what are now Iran, Afghanistan, and Pakistan, by the 9th century AD. The earliest practical
steam-powered machine was a
steam jack driven by a
steam turbine, described in 1551 by
Taqi al-Din Muhammad ibn Ma'ruf in
Ottoman Egypt.
The
cotton gin
A cotton gin—meaning "cotton engine"—is a machine that quickly and easily separates cotton fibers from their seeds, enabling much greater productivity than manual cotton separation.. Reprinted by McGraw-Hill, New York and London, 1926 (); a ...
was invented in India by the 6th century AD, and the
spinning wheel was invented in the
Islamic world
The terms Muslim world and Islamic world commonly refer to the Islamic community, which is also known as the Ummah. This consists of all those who adhere to the religious beliefs and laws of Islam or to societies in which Islam is practiced. In ...
by the early 11th century,
both of which were fundamental to the growth of the
cotton industry
Cotton is a soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of the cotton plants of the genus '' Gossypium'' in the mallow family Malvaceae. The fiber is almost pure cellulose, and can contain minor p ...
. The spinning wheel was also a precursor to the
spinning jenny, which was a key development during the early
Industrial Revolution
The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
in the 18th century.
The earliest
programmable machines were developed in the Muslim world. A
music sequencer
A music sequencer (or audio sequencer or simply sequencer) is a device or application software that can record, edit, or play back music, by handling Musical note, note and performance information in several forms, typically CV/Gate, MIDI, or O ...
, a programmable
musical instrument, was the earliest type of programmable machine. The first music sequencer was an automated
flute player invented by the
Banu Musa brothers, described in their ''
Book of Ingenious Devices'', in the 9th century.
In 1206, Al-Jazari invented programmable
automata/
robot
A robot is a machine—especially one programmable by a computer—capable of carrying out a complex series of actions automatically. A robot can be guided by an external control device, or the control may be embedded within. Robots may be ...
s. He described four
automaton
An automaton (; plural: automata or automatons) is a relatively self-operating machine, or control mechanism designed to automatically follow a sequence of operations, or respond to predetermined instructions.Automaton – Definition and More ...
musicians, including drummers operated by a programmable
drum machine, where they could be made to play different rhythms and different drum patterns.
[Professor Noel Sharkey]
A 13th Century Programmable Robot (Archive)
University of Sheffield
The University of Sheffield (informally Sheffield University or TUOS) is a public university, public research university in Sheffield, South Yorkshire, England. Its history traces back to the foundation of Sheffield Medical School in 1828, Firth C ...
. The
castle clock, a
hydropower
Hydropower (from el, ὕδωρ, "water"), also known as water power, is the use of falling or fast-running water to produce electricity or to power machines. This is achieved by converting the gravitational potential or kinetic energy of ...
ed mechanical
astronomical clock invented by Al-Jazari, was the first
programmable analog computer.
[ Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", ''Scientific American'', May 1991, pp. 64–9 ( cf. Donald Routledge Hill]
Mechanical Engineering
)

Before the development of modern engineering, mathematics was used by artisans and craftsmen, such as
millwrights,
clockmakers, instrument makers and surveyors. Aside from these professions, universities were not believed to have had much practical significance to technology.
A standard reference for the state of mechanical arts during the Renaissance is given in the mining engineering treatise ''
De re metallica'' (1556), which also contains sections on geology, mining, and chemistry. ''De re metallica'' was the standard chemistry reference for the next 180 years.
Modern era

The science of
classical mechanics
Classical mechanics is a physical theory describing the motion of macroscopic objects, from projectiles to parts of machinery, and astronomical objects, such as spacecraft, planets, stars, and galaxies. For objects governed by classical ...
, sometimes called Newtonian mechanics, formed the scientific basis of much of modern engineering.
With the rise of engineering as a
profession
A profession is a field of Work (human activity), work that has been successfully ''professionalized''. It can be defined as a disciplined group of individuals, ''Professional, professionals'', who adhere to ethical standards and who hold the ...
in the 18th century, the term became more narrowly applied to fields in which mathematics and science were applied to these ends. Similarly, in addition to military and civil engineering, the fields then known as the
mechanic arts became incorporated into engineering.
Canal building was an important engineering work during the early phases of the Industrial Revolution.
John Smeaton
John Smeaton (8 June 1724 – 28 October 1792) was a British civil engineer responsible for the design of bridges, canals, harbours and lighthouses. He was also a capable mechanical engineer and an eminent physicist. Smeaton was the firs ...
was the first self-proclaimed civil engineer and is often regarded as the "father" of civil engineering. He was an English civil engineer responsible for the design of bridges, canals, harbors, and lighthouses. He was also a capable
mechanical engineer and an eminent
physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.
Physicists generally are interested in the root or ultimate ca ...
. Using a model water wheel, Smeaton conducted experiments for seven years, determining ways to increase efficiency.
Smeaton introduced iron axles and gears to water wheels.
Smeaton also made mechanical improvements to the
Newcomen steam engine. Smeaton designed the third
Eddystone Lighthouse (1755–59) where he pioneered the use of '
hydraulic lime' (a form of
mortar which will set under water) and developed a technique involving dovetailed blocks of granite in the building of the lighthouse. He is important in the history, rediscovery of, and development of modern
cement
A cement is a binder, a chemical substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement m ...
, because he identified the compositional requirements needed to obtain "hydraulicity" in lime; work which led ultimately to the invention of
Portland cement.
Applied science lead to the development of the steam engine. The sequence of events began with the invention of the
barometer
A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis ...
and the measurement of atmospheric pressure by
Evangelista Torricelli in 1643, demonstration of the force of atmospheric pressure by
Otto von Guericke using the
Magdeburg hemispheres in 1656, laboratory experiments by
Denis Papin, who built experimental model steam engines and demonstrated the use of a piston, which he published in 1707.
Edward Somerset, 2nd Marquess of Worcester published a book of 100 inventions containing a method for raising waters similar to a
coffee percolator.
Samuel Morland, a mathematician and inventor who worked on pumps, left notes at the Vauxhall Ordinance Office on a steam pump design that
Thomas Savery read. In 1698 Savery built a steam pump called "The Miner's Friend." It employed both vacuum and pressure. Iron merchant
Thomas Newcomen, who built the first commercial piston steam engine in 1712, was not known to have any scientific training.

The application of steam-powered cast iron blowing cylinders for providing pressurized air for
blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. ''Blast'' refers to the combustion air being "forced" or supplied above atmospheric p ...
s lead to a large increase in iron production in the late 18th century. The higher furnace temperatures made possible with steam-powered blast allowed for the use of more lime in
blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. ''Blast'' refers to the combustion air being "forced" or supplied above atmospheric p ...
s, which enabled the transition from charcoal to
coke. These innovations lowered the cost of iron, making
horse railways and iron bridges practical. The
puddling process, patented by
Henry Cort in 1784 produced large scale quantities of wrought iron.
Hot blast
Hot blast refers to the preheating of air blown into a blast furnace or other metallurgical process. As this considerably reduced the fuel consumed, hot blast was one of the most important technologies developed during the Industrial Revolution ...
, patented by
James Beaumont Neilson
James Beaumont Neilson (22 June 1792 – 18 January 1865) was a Scottish inventor whose hot-blast process greatly increased the efficiency of smelting iron.
Life
He was the son of the engineer Walter Neilson, a millwright and later engin ...
in 1828, greatly lowered the amount of fuel needed to smelt iron. With the development of the high pressure steam engine, the power to weight ratio of steam engines made practical steamboats and locomotives possible.
New steel making processes, such as the
Bessemer process and the open hearth furnace, ushered in an area of heavy engineering in the late 19th century.
One of the most famous engineers of the mid 19th century was
Isambard Kingdom Brunel
Isambard Kingdom Brunel (; 9 April 1806 – 15 September 1859) was a British civil engineer who is considered "one of the most ingenious and prolific figures in engineering history," "one of the 19th-century engineering giants," and "one ...
, who built railroads, dockyards and steamships.

The
Industrial Revolution
The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
created a demand for machinery with metal parts, which led to the development of several
machine tools. Boring cast iron cylinders with precision was not possible until
John Wilkinson invented his
boring machine, which is considered the first
machine tool
A machine tool is a machine for handling or machining metal or other rigid materials, usually by cutting, boring, grinding, shearing, or other forms of deformations. Machine tools employ some sort of tool that does the cutting or shaping. All ...
. Other machine tools included the
screw cutting lathe,
milling machine
Milling is the process of machining using rotary cutters to remove material by advancing a cutter into a workpiece. This may be done by varying direction on one or several axes, cutter head speed, and pressure. Milling covers a wide variety of d ...
,
turret lathe and the
metal planer. Precision machining techniques were developed in the first half of the 19th century. These included the use of gigs to guide the machining tool over the work and fixtures to hold the work in the proper position. Machine tools and machining techniques capable of producing
interchangeable parts lead to
large scale factory production by the late 19th century.
The United States census of 1850 listed the occupation of "engineer" for the first time with a count of 2,000. There were fewer than 50 engineering graduates in the U.S. before 1865. In 1870 there were a dozen U.S. mechanical engineering graduates, with that number increasing to 43 per year in 1875. In 1890, there were 6,000 engineers in civil,
mining
Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the economic ...
, mechanical and electrical.
There was no chair of applied mechanism and applied mechanics at Cambridge until 1875, and no chair of engineering at Oxford until 1907. Germany established technical universities earlier.
The foundations of
electrical engineering in the 1800s included the experiments of
Alessandro Volta,
Michael Faraday
Michael Faraday (; 22 September 1791 – 25 August 1867) was an English scientist who contributed to the study of electromagnetism and electrochemistry. His main discoveries include the principles underlying electromagnetic inductio ...
,
Georg Ohm and others and the invention of the
electric telegraph in 1816 and the
electric motor
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate forc ...
in 1872. The theoretical work of
James Maxwell (see:
Maxwell's equations
Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits.
Th ...
) and
Heinrich Hertz
Heinrich Rudolf Hertz ( ; ; 22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism. The unit ...
in the late 19th century gave rise to the field of
electronics
The field of electronics is a branch of physics and electrical engineering that deals with the emission, behaviour and effects of electrons using electronic devices. Electronics uses active devices to control electron flow by amplification ...
. The later inventions of the
vacuum tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied.
The type kn ...
and the
transistor
upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink).
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch ...
further accelerated the development of electronics to such an extent that electrical and electronics engineers currently outnumber their colleagues of any other engineering specialty.
Chemical engineering
Chemical engineering is an engineering field which deals with the study of operation and design of chemical plants as well as methods of improving production. Chemical engineers develop economical commercial processes to convert raw materials in ...
developed in the late nineteenth century.
Industrial scale manufacturing demanded new materials and new processes and by 1880 the need for large scale production of chemicals was such that a new industry was created, dedicated to the development and large scale manufacturing of chemicals in new industrial plants.
The role of the chemical engineer was the design of these chemical plants and processes.

Aeronautical engineering deals with
aircraft design process design while
aerospace engineering
Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: aeronautical engineering and astronautical engineering. Avionics engineering is s ...
is a more modern term that expands the reach of the discipline by including
spacecraft
A spacecraft is a vehicle or machine designed to spaceflight, fly in outer space. A type of artificial satellite, spacecraft are used for a variety of purposes, including Telecommunications, communications, Earth observation satellite, Earth ...
design. Its origins can be traced back to the aviation pioneers around the start of the 20th century although the work of
Sir George Cayley
Sir George Cayley, 6th Baronet (27 December 1773 – 15 December 1857) was an English engineer, inventor, and aviator. He is one of the most important people in the history of aeronautics. Many consider him to be the first true scientific aer ...
has recently been dated as being from the last decade of the 18th century. Early knowledge of aeronautical engineering was largely empirical with some concepts and skills imported from other branches of engineering.
The first
PhD PHD or PhD may refer to:
* Doctor of Philosophy (PhD), an academic qualification
Entertainment
* '' PhD: Phantasy Degree'', a Korean comic series
* ''Piled Higher and Deeper'', a web comic
* Ph.D. (band), a 1980s British group
** Ph.D. (Ph.D. albu ...
in engineering (technically, ''applied science and engineering'') awarded in the United States went to
Josiah Willard Gibbs at
Yale University
Yale University is a Private university, private research university in New Haven, Connecticut. Established in 1701 as the Collegiate School, it is the List of Colonial Colleges, third-oldest institution of higher education in the United Sta ...
in 1863; it was also the second PhD awarded in science in the U.S.
Only a decade after the successful flights by the
Wright brothers, there was extensive development of aeronautical engineering through development of military aircraft that were used in
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
. Meanwhile, research to provide fundamental background science continued by combining
theoretical physics
Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experi ...
with experiments.
Main branches of engineering

Engineering is a broad discipline that is often broken down into several sub-disciplines. Although an engineer will usually be trained in a specific discipline, he or she may become multi-disciplined through experience. Engineering is often characterized as having four main branches:
[The Engineering Profession](_blank)
by Sir James Hamilton, UK Engineering Council Quote: "The Civilingenior degree encompasses the main branches of engineering civil, mechanical, electrical, chemical." (From the Internet Archive) chemical engineering, civil engineering, electrical engineering, and mechanical engineering.
Chemical engineering
Chemical engineering is the application of physics, chemistry, biology, and engineering principles in order to carry out chemical processes on a commercial scale, such as the manufacture of
commodity chemicals,
specialty chemicals,
petroleum refining,
microfabrication,
fermentation, and
biomolecule production.
Civil engineering
Civil engineering is the design and construction of public and private works, such as
infrastructure (airports, roads, railways, water supply, and treatment etc.), bridges, tunnels, dams, and buildings. Civil engineering is traditionally broken into a number of sub-disciplines, including
structural engineering
Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and muscles' that create the form and shape of man-made structures. Structural engineers also must understand and ca ...
,
environmental engineering
Environmental engineering is a professional engineering discipline that encompasses broad scientific topics like chemistry, biology, ecology, geology, hydraulics, hydrology, microbiology, and mathematics to create solutions that will protect and ...
, and
surveying. It is traditionally considered to be separate from
military engineering.
Electrical engineering

Electrical engineering is the design, study, and manufacture of various electrical and electronic systems, such as
broadcast engineering
Broadcast engineering is the field of electrical engineering, and now to some extent computer engineering and information technology, which deals with radio and television broadcasting. Audio engineering and RF engineering are also essential par ...
,
electrical circuit
An electrical network is an interconnection of electrical components (e.g., batteries, resistors, inductors, capacitors, switches, transistors) or a model of such an interconnection, consisting of electrical elements (e.g., voltage sour ...
s,
generators,
motors,
electromagnetic/
electromechanical devices,
electronic devices,
electronic circuits,
optical fiber
An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparency and translucency, transparent fiber made by Drawing (manufacturing), drawing glass (silica) or plastic to a diameter slightly thicker than that of a Hair ...
s,
optoelectronic devices,
computer systems,
telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than tha ...
,
instrumentation,
control system
A control system manages, commands, directs, or regulates the behavior of other devices or systems using control loops. It can range from a single home heating controller using a thermostat controlling a domestic boiler to large industrial ...
s, and
electronics
The field of electronics is a branch of physics and electrical engineering that deals with the emission, behaviour and effects of electrons using electronic devices. Electronics uses active devices to control electron flow by amplification ...
.
Mechanical engineering
Mechanical engineering is the design and manufacture of physical or mechanical systems, such as power and
energy
In physics, energy (from Ancient Greek: ἐνέργεια, ''enérgeia'', “activity”) is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of hea ...
systems,
aerospace
Aerospace is a term used to collectively refer to the atmosphere and outer space. Aerospace activity is very diverse, with a multitude of commercial, industrial and military applications. Aerospace engineering consists of aeronautics and astrona ...
/
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. ...
products,
weapon systems,
transportation
Transport (in British English), or transportation (in American English), is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air, land ( rail and road), water, cable, pipel ...
products,
engines,
compressors,
powertrains,
kinematic chain
In mechanical engineering, a kinematic chain is an assembly of rigid bodies connected by joints to provide constrained (or desired) motion that is the mathematical model for a mechanical system. Reuleaux, F., 187''The Kinematics of Machine ...
s, vacuum technology,
vibration isolation equipment,
manufacturing
Manufacturing is the creation or production of goods with the help of equipment, labor, machines, tools, and chemical or biological processing or formulation. It is the essence of secondary sector of the economy. The term may refer to a ...
, robotics, turbines, audio equipments, and
mechatronics.
Bioengineering
Bioengineering is the engineering of biological systems for a useful purpose. Examples of bioengineering research include bacteria engineered to produce chemicals, new medical imaging technology, portable and rapid disease diagnostic devices, prosthetics, biopharmaceuticals, and tissue-engineered organs.
Interdisciplinary engineering
Interdisciplinary engineering draws from more than one of the principle branches of the practice. Historically,
naval engineering and
mining engineering were major branches. Other engineering fields are
manufacturing engineering
Manufacturing engineering or production engineering is a branch of professional engineering that shares many common concepts and ideas with other fields of engineering such as mechanical, chemical, electrical, and industrial engineering.
Manufa ...
,
acoustical engineering
Acoustical engineering (also known as acoustic engineering) is the branch of engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers are typic ...
,
corrosion engineering,
instrumentation and control,
aerospace
Aerospace is a term used to collectively refer to the atmosphere and outer space. Aerospace activity is very diverse, with a multitude of commercial, industrial and military applications. Aerospace engineering consists of aeronautics and astrona ...
,
automotive,
computer,
electronic,
information engineering,
petroleum
Petroleum, also known as crude oil, or simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, and is found in geological formations. The name ''petroleum'' covers both naturally occurring unprocessed crude ...
,
environmental,
systems,
audio,
software
Software is a set of computer programs and associated software documentation, documentation and data (computing), data. This is in contrast to Computer hardware, hardware, from which the system is built and which actually performs the work.
...
,
architectural
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing buildings ...
,
agricultural
Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled peopl ...
,
biosystems,
biomedical,
geological,
textile
Textile is an umbrella term that includes various fiber-based materials, including fibers, yarns, filaments, threads, different fabric types, etc. At first, the word "textiles" only referred to woven fabrics. However, weaving is not t ...
,
industrial,
materials
Material is a substance or mixture of substances that constitutes an object. Materials can be pure or impure, living or non-living matter. Materials can be classified on the basis of their physical and chemical properties, or on their geologica ...
, and
nuclear engineering. These and other branches of engineering are represented in the 36 licensed member institutions of the UK
Engineering Council.
New specialties sometimes combine with the traditional fields and form new branches – for example,
Earth systems engineering and management involves a wide range of subject areas including
engineering studies
Engineering studies is an interdisciplinary branch of social sciences and humanities devoted to the study of engineers and their activities, often considered a part of science and technology studies (STS), and intersecting with and drawing from e ...
,
environmental science
Environmental science is an interdisciplinary academic field that integrates physics, biology, and geography (including ecology, chemistry, plant science, zoology, mineralogy, oceanography, limnology, soil science, geology and physical ...
,
engineering ethics and
philosophy of engineering The philosophy of engineering is an emerging discipline that considers what engineering is, what engineers do, and how their work affects society, and thus includes aspects of ethics and aesthetics, as well as the ontology, epistemology, etc. that m ...
.
Other branches of engineering
Aerospace engineering

Aerospace engineering covers the design, development, manufacture and operational behaviour of
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. ...
,
satellite
A satellite or artificial satellite is an object intentionally placed into orbit in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioiso ...
s and
rocket
A rocket (from it, rocchetto, , bobbin/spool) is a vehicle that uses jet propulsion to accelerate without using the surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entire ...
s.
Marine engineering
Marine engineering covers the design,development,manufacture and operational behaviour of
watercraft and stationary structures like
oil platforms and
port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as ...
s.
Computer engineering
Computer engineering (CE) is a branch of engineering that integrates several fields of computer science and
electronic engineering
Electronics engineering is a sub-discipline of electrical engineering which emerged in the early 20th century and is distinguished by the additional use of active components such as semiconductor devices to amplify and control electric current ...
required to develop
computer hardware and
software
Software is a set of computer programs and associated software documentation, documentation and data (computing), data. This is in contrast to Computer hardware, hardware, from which the system is built and which actually performs the work.
...
. Computer engineers usually have training in electronic engineering (or
electrical engineering),
software design, and hardware-software integration instead of only
software engineering
Software engineering is a systematic engineering approach to software development.
A software engineer is a person who applies the principles of software engineering to design, develop, maintain, test, and evaluate computer software. The term ' ...
or electronic engineering.
Geological engineering
Geological engineering is associated with anything constructed on or within the Earth. This discipline applies
geological sciences and engineering principles to direct or support the work of other disciplines such as
civil engineering
Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewa ...
,
environmental engineering
Environmental engineering is a professional engineering discipline that encompasses broad scientific topics like chemistry, biology, ecology, geology, hydraulics, hydrology, microbiology, and mathematics to create solutions that will protect and ...
, and
mining engineering. Geological engineers are involved with impact studies for facilities and operations that affect surface and subsurface environments, such as rock excavations (e.g.
tunnels),
building foundation consolidation, slope and fill stabilization,
landslide risk assessment, groundwater monitoring,
groundwater remediation, mining excavations, and
natural resource
Natural resources are resources that are drawn from nature and used with few modifications. This includes the sources of valued characteristics such as commercial and industrial use, aesthetic value, scientific interest and cultural value. ...
exploration.
Practice
One who practices engineering is called an
engineer
Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the l ...
, and those licensed to do so may have more formal designations such as
Professional Engineer,
Chartered Engineer,
Incorporated Engineer,
Ingenieur
An engineer's degree is an advanced academic degree in engineering which is conferred in Europe, some countries of Latin America, North Africa and a few institutions in the United States. The degree may require a thesis but always requires a non- ...
,
European Engineer, or
Designated Engineering Representative.
Methodology

In the
engineering design process, engineers apply mathematics and sciences such as physics to find novel solutions to problems or to improve existing solutions. Engineers need proficient knowledge of relevant sciences for their design projects. As a result, many engineers continue to learn new material throughout their careers.
If multiple solutions exist, engineers weigh each design choice based on their merit and choose the solution that best matches the requirements. The task of the engineer is to identify, understand, and interpret the constraints on a design in order to yield a successful result. It is generally insufficient to build a technically successful product, rather, it must also meet further requirements.
Constraints may include available resources, physical, imaginative or technical limitations, flexibility for future modifications and additions, and other factors, such as requirements for cost,
safety, marketability, productivity, and
serviceability. By understanding the constraints, engineers derive
specifications for the limits within which a viable object or system may be produced and operated.
Problem solving

Engineers use their knowledge of
science
Science is a systematic endeavor that Scientific method, builds and organizes knowledge in the form of Testability, testable explanations and predictions about the universe.
Science may be as old as the human species, and some of the earli ...
,
mathematics,
logic
Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premis ...
,
economics
Economics () is the social science that studies the production, distribution, and consumption of goods and services.
Economics focuses on the behaviour and interactions of economic agents and how economies work. Microeconomics analy ...
, and
appropriate experience or
tacit knowledge to find suitable solutions to a particular problem. Creating an appropriate
mathematical model
A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling. Mathematical models are used in the natural sciences (such as physics, ...
of a problem often allows them to analyze it (sometimes definitively), and to test potential solutions.
More than one solution to a design problem usually exists so the different
design choices have to be evaluated on their merits before the one judged most suitable is chosen.
Genrich Altshuller, after gathering statistics on a large number of
patent
A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an sufficiency of disclosure, enabling disclo ...
s, suggested that
compromises are at the heart of "
low-level
High-level and low-level, as technical terms, are used to classify, describe and point to specific goals of a systematic operation; and are applied in a wide range of contexts, such as, for instance, in domains as widely varied as computer scienc ...
" engineering designs, while at a higher level the best design is one which eliminates the core contradiction causing the problem.
Engineers typically attempt to predict how well their designs will perform to their specifications prior to full-scale production. They use, among other things:
prototypes,
scale models,
simulation
A simulation is the imitation of the operation of a real-world process or system over time. Simulations require the use of models; the model represents the key characteristics or behaviors of the selected system or process, whereas the ...
s,
destructive tests,
nondestructive tests, and
stress tests. Testing ensures that products will perform as expected but only in so far as the testing has been representative of use in service. For products, such as aircraft, that are used differently by different users failures and unexpected shortcomings (and necessary design changes) can be expected throughout the operational life of the product.
Engineers take on the responsibility of producing designs that will perform as well as expected and, except those employed in specific areas of the
arms industry, will not harm people. Engineers typically include a
factor of safety in their designs to reduce the risk of unexpected failure.
The study of failed products is known as
forensic engineering. It attempts to identify the cause of failure to allow a redesign of the product and so prevent a re-occurrence. Careful analysis is needed to establish the cause of failure of a product. The consequences of a failure may vary in severity from the minor cost of a machine breakdown to large loss of life in the case of accidents involving aircraft and large stationary structures like buildings and dams.
Computer use

As with all modern scientific and technological endeavors, computers and software play an increasingly important role. As well as the typical business
application software
Application may refer to:
Mathematics and computing
* Application software, computer software designed to help the user to perform specific tasks
** Application layer, an abstraction layer that specifies protocols and interface methods used in a ...
there are a number of computer aided applications (
computer-aided technologies
Computer-aided technologies (CAx) is the use of computer technology to aid in the design, analysis, and manufacture of products.
Advanced CAx tools merge many different aspects of the product lifecycle management (PLM), including design, finite ...
) specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using
numerical methods.

One of the most widely used
design tool
Design tools are objects, media, or computer programs, which can be used to design. They may influence the process of production, expression and perception of design ideas and therefore need to be applied skillfully.
Objects
New ideas can come ...
s in the profession is
computer-aided design (CAD) software. It enables engineers to create 3D models, 2D drawings, and schematics of their designs. CAD together with
digital mockup (DMU) and
CAE CAE may refer to:
Organisations Aviation
* CAE Aviation, a Luxembourgian aviation services company
* CAE Inc. (formerly Canadian Aviation Electronics), a Canadian manufacturer of simulation technologies and training provider
* Régional Compagnie A ...
software such as
finite element method analysis or
analytic element method The analytic element method (AEM) is a numerical method used for the solution of partial differential equations. It was initially developed by O.D.L. Strack at the University of Minnesota. It is similar in nature to the boundary element method (B ...
allows engineers to create models of designs that can be analyzed without having to make expensive and time-consuming physical prototypes.
These allow products and components to be checked for flaws; assess fit and assembly; study ergonomics; and to analyze static and dynamic characteristics of systems such as stresses, temperatures, electromagnetic emissions, electrical currents and voltages, digital logic levels, fluid flows, and kinematics. Access and distribution of all this information is generally organized with the use of
product data management software.
There are also many tools to support specific engineering tasks such as
computer-aided manufacturing
Computer-aided manufacturing (CAM) also known as computer-aided modeling or computer-aided machining is the use of software to control machine tools in the manufacturing of work pieces. This is not the only definition for CAM, but it is the most ...
(CAM) software to generate
CNC machining instructions;
manufacturing process management software for production engineering;
EDA for
printed circuit board
A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a laminated sandwich str ...
(PCB) and circuit
schematics for electronic engineers;
MRO applications for maintenance management; and Architecture, engineering and construction (AEC) software for civil engineering.
In recent years the use of computer software to aid the development of goods has collectively come to be known as
product lifecycle management
In industry, Product Lifecycle Management (PLM) is the process of managing the entire lifecycle of a product from its inception through the engineering, design and manufacture, as well as the service and disposal of manufactured products. P ...
(PLM).
Social context

The engineering profession engages in a wide range of activities, from large collaboration at the societal level, and also smaller individual projects. Almost all engineering projects are obligated to some sort of financing agency: a company, a set of investors, or a government. The few types of engineering that are minimally constrained by such issues are ''
pro bono'' engineering and
open-design engineering.
By its very nature engineering has interconnections with society, culture and human behavior. Every product or construction used by modern society is influenced by engineering. The results of engineering activity influence changes to the environment, society and economies, and its application brings with it a responsibility and public safety.
Engineering projects can be subject to controversy. Examples from different engineering disciplines include the development of
nuclear weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bom ...
s, the
Three Gorges Dam, the design and use of
sport utility vehicles and the extraction of
oil. In response, some western engineering companies have enacted serious
corporate and social responsibility policies.
Engineering is a key driver of innovation and human development. Sub-Saharan Africa, in particular, has a very small engineering capacity which results in many African nations being unable to develop crucial infrastructure without outside aid. The attainment of many of the
Millennium Development Goals requires the achievement of sufficient engineering capacity to develop infrastructure and sustainable technological development.

All overseas development and relief NGOs make considerable use of engineers to apply solutions in disaster and development scenarios. A number of charitable organizations aim to use engineering directly for the good of mankind:
*
Engineers Without Borders
*
Engineers Against Poverty
Engineers Against Poverty (EAP) is a specialist British NGO working in the field of engineering and international development. It was established in 1998 by the Royal Academy of Engineering and the Department for International Development
, ...
* Registered Engineers for Disaster Relief
*
Engineers for a Sustainable World
Engineers for a Sustainable World (ESW) is a not-for-profit network headquartered in Pittsburgh, PA, USA. ESW is an umbrella organization with chapters established at over 50 colleges, universities, and city chapters located primarily in the Unite ...
*
Engineering for Change
* Engineering Ministries International
[Home page for EMI](_blank)
Engineering companies in many established economies are facing significant challenges with regard to the number of professional engineers being trained, compared with the number retiring. This problem is very prominent in the UK where engineering has a poor image and low status. There are many negative economic and political issues that this can cause, as well as ethical issues. It is widely agreed that the engineering profession faces an "image crisis", rather than it being fundamentally an unattractive career. Much work is needed to avoid huge problems in the UK and other western economies. Still, the UK holds
most engineering companies compared to other European countries, together with the United States.
Code of ethics
Many
engineering societies have established codes of practice and
codes of ethics
Ethical codes are adopted by organizations to assist members in understanding the difference between right and wrong and in applying that understanding to their decisions. An ethical code generally implies documents at three levels: codes of bus ...
to guide members and inform the public at large. The
National Society of Professional Engineers code of ethics states:
In Canada, many engineers wear the
Iron Ring as a symbol and reminder of the obligations and ethics associated with their profession.
Relationships with other disciplines
Science

There exists an overlap between the sciences and engineering practice; in engineering, one applies science. Both areas of endeavor rely on accurate observation of materials and phenomena. Both use mathematics and classification criteria to analyze and communicate observations.
Scientists may also have to complete engineering tasks, such as designing experimental apparatus or building prototypes. Conversely, in the process of developing technology, engineers sometimes find themselves exploring new phenomena, thus becoming, for the moment, scientists or more precisely "engineering scientists".

In the book ''
What Engineers Know and How They Know It'',
Walter Vincenti
Walter Guido Vincenti (April 20, 1917 – October 11, 2019) was an American engineer who worked in the field of aeronautics, designing planes that could fly at hypersonic speed. He was elected as a member of several scientific societies, incl ...
asserts that engineering research has a character different from that of scientific research. First, it often deals with areas in which the basic
physics
Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which rel ...
or
chemistry are well understood, but the problems themselves are too complex to solve in an exact manner.
There is a "real and important" difference between engineering and physics as similar to any science field has to do with technology. Physics is an exploratory science that seeks knowledge of principles while engineering uses knowledge for practical applications of principles. The former equates an understanding into a mathematical principle while the latter measures variables involved and creates technology. For technology, physics is an auxiliary and in a way technology is considered as applied physics. Though physics and engineering are interrelated, it does not mean that a physicist is trained to do an engineer's job. A physicist would typically require additional and relevant training. Physicists and engineers engage in different lines of work. But PhD physicists who specialize in sectors of
engineering physics
Engineering physics, or engineering science, refers to the study of the combined disciplines of physics, mathematics, chemistry, biology, and engineering, particularly computer, nuclear, electrical, electronic, aerospace, materials or mechanical en ...
and
applied physics are titled as Technology officer, R&D Engineers and System Engineers.
An example of this is the use of numerical approximations to the
Navier–Stokes equations
In physics, the Navier–Stokes equations ( ) are partial differential equations which describe the motion of viscous fluid substances, named after French engineer and physicist Claude-Louis Navier and Anglo-Irish physicist and mathematician G ...
to describe aerodynamic flow over an aircraft, or the use of the
Finite element method to calculate the stresses in complex components. Second, engineering research employs many semi-
empirical methods
Empirical research is research using empirical evidence. It is also a way of gaining knowledge by means of direct and indirect observation or experience. Empiricism values some research more than other kinds. Empirical evidence (the record of ...
that are foreign to pure scientific research, one example being the method of parameter variation.
As stated by Fung ''et al.'' in the revision to the classic engineering text ''Foundations of Solid Mechanics'':
Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress innovation and invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a complex system, device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what already exists. Since a design has to be realistic and functional, it must have its geometry, dimensions, and characteristics data defined. In the past engineers working on new designs found that they did not have all the required information to make design decisions. Most often, they were limited by insufficient scientific knowledge. Thus they studied mathematics, physics
Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which rel ...
, chemistry, biology
Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of cells that process hereditar ...
and mechanics
Mechanics (from Ancient Greek: μηχανική, ''mēkhanikḗ'', "of machines") is the area of mathematics and physics concerned with the relationships between force, matter, and motion among physical objects. Forces applied to objects ...
. Often they had to add to the sciences relevant to their profession. Thus engineering sciences were born.
Although engineering solutions make use of scientific principles, engineers must also take into account safety, efficiency, economy, reliability, and constructability or ease of fabrication as well as the environment, ethical and legal considerations such as patent infringement or liability in the case of failure of the solution.
Medicine and biology

The study of the human body, albeit from different directions and for different purposes, is an important common link between medicine and some engineering disciplines.
Medicine
Medicine is the science and Praxis (process), practice of caring for a patient, managing the diagnosis, prognosis, Preventive medicine, prevention, therapy, treatment, Palliative care, palliation of their injury or disease, and Health promotion ...
aims to sustain, repair, enhance and even replace functions of the
human body, if necessary, through the use of
technology
Technology is the application of knowledge to reach practical goals in a specifiable and reproducible way. The word ''technology'' may also mean the product of such an endeavor. The use of technology is widely prevalent in medicine, scie ...
.

Modern medicine can replace several of the body's functions through the use of artificial organs and can significantly alter the function of the human body through artificial devices such as, for example,
brain implants and
pacemakers.
The fields of
bionics and medical bionics are dedicated to the study of synthetic implants pertaining to natural systems.
Conversely, some engineering disciplines view the human body as a biological machine worth studying and are dedicated to emulating many of its functions by replacing
biology
Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of cells that process hereditar ...
with technology. This has led to fields such as
artificial intelligence
Artificial intelligence (AI) is intelligence—perceiving, synthesizing, and inferring information—demonstrated by machine
A machine is a physical system using Power (physics), power to apply Force, forces and control Motion, moveme ...
,
neural networks
A neural network is a network or circuit of biological neurons, or, in a modern sense, an artificial neural network, composed of artificial neurons or nodes. Thus, a neural network is either a biological neural network, made up of biological ...
,
fuzzy logic
Fuzzy logic is a form of many-valued logic in which the truth value of variables may be any real number between 0 and 1. It is employed to handle the concept of partial truth, where the truth value may range between completely true and complet ...
, and
robot
A robot is a machine—especially one programmable by a computer—capable of carrying out a complex series of actions automatically. A robot can be guided by an external control device, or the control may be embedded within. Robots may be ...
ics. There are also substantial interdisciplinary interactions between engineering and medicine.
[Institute of Medicine and Engineering: Mission statement The mission of the Institute for Medicine and Engineering (IME) is to stimulate fundamental research at the interface between biomedicine and engineering/physical/computational sciences leading to innovative applications in biomedical research and clinical practice.](_blank)
Both fields provide solutions to real world problems. This often requires moving forward before phenomena are completely understood in a more rigorous scientific sense and therefore experimentation and empirical knowledge is an integral part of both.
Medicine, in part, studies the function of the human body. The human body, as a biological machine, has many functions that can be modeled using engineering methods.
[Royal Academy of Engineering and Academy of Medical Sciences: Systems Biology: a vision for engineering and medicine in pdf: quote1: Systems Biology is an emerging methodology that has yet to be defined quote2: It applies the concepts of systems engineering to the study of complex biological systems through iteration between computational or mathematical modelling and experimentation.](_blank)
The heart for example functions much like a pump,
the skeleton is like a linked structure with levers,
the brain produces
electrical signals etc.
These similarities as well as the increasing importance and application of engineering principles in medicine, led to the development of the field of
biomedical engineering that uses concepts developed in both disciplines.
Newly emerging branches of science, such as
systems biology, are adapting analytical tools traditionally used for engineering, such as systems modeling and computational analysis, to the description of biological systems.
Art

There are connections between engineering and art, for example,
architecture
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing buildings ...
,
landscape architecture
Landscape architecture is the design of outdoor areas, landmarks, and structures to achieve environmental, social-behavioural, or aesthetic outcomes. It involves the systematic design and general engineering of various structures for constructio ...
and
industrial design (even to the extent that these disciplines may sometimes be included in a university's
Faculty
Faculty may refer to:
* Faculty (academic staff), the academic staff of a university (North American usage)
* Faculty (division), a division within a university (usage outside of the United States)
* Faculty (instrument)
A faculty is a legal in ...
of Engineering).
[MIT World:The Art of Engineering: Inventor James Dyson on the Art of Engineering: quote: A member of the British Design Council, James Dyson has been designing products since graduating from the Royal College of Art in 1970.](_blank)
The
Art Institute of Chicago
The Art Institute of Chicago in Chicago's Grant Park, founded in 1879, is one of the oldest and largest art museums in the world. Recognized for its curatorial efforts and popularity among visitors, the museum hosts approximately 1.5 mil ...
, for instance, held an exhibition about the art of
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research.
NASA was established in 1958, succeedi ...
's aerospace design.
Robert Maillart's bridge design is perceived by some to have been deliberately artistic.
At the
University of South Florida, an engineering professor, through a grant with the
National Science Foundation, has developed a course that connects art and engineering.
[quote:..the tools of artists and the perspective of engineers..](_blank)
Among famous historical figures,
Leonardo da Vinci
Leonardo di ser Piero da Vinci (15 April 14522 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, Drawing, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially re ...
is a well-known
Renaissance
The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass id ...
artist and engineer, and a prime example of the nexus between art and engineering.
[Bjerklie, David. "The Art of Renaissance Engineering." ''MIT's Technology Review'' Jan./Feb.1998: 54–59. Article explores the concept of the "artist-engineer", an individual who used his artistic talent in engineering. Quote from article: Da Vinci reached the pinnacle of "artist-engineer"-dom, Quote2: "It was Leonardo da Vinci who initiated the most ambitious expansion in the role of artist-engineer, progressing from astute observer to inventor to theoretician." (Bjerklie 58)][Drew U: user website: cites Bjerklie paper](_blank)
Business
Business Engineering deals with the relationship between professional engineering, IT systems, business administration and
change management.
Engineering management or "Management engineering" is a specialized field of
management
Management (or managing) is the administration of an organization, whether it is a business, a nonprofit organization, or a government body. It is the art and science of managing resources of the business.
Management includes the activities ...
concerned with engineering practice or the engineering industry sector. The demand for management-focused engineers (or from the opposite perspective, managers with an understanding of engineering), has resulted in the development of specialized engineering management degrees that develop the knowledge and skills needed for these roles. During an engineering management course, students will develop
industrial engineering skills, knowledge, and expertise, alongside knowledge of business administration, management techniques, and strategic thinking. Engineers specializing in change management must have in-depth knowledge of the application of
industrial and organizational psychology principles and methods. Professional engineers often train as
certified management consultants in the very specialized field of
management consulting
Management consulting is the practice of providing consulting services to organizations to improve their performance or in any way to assist in achieving organizational objectives. Organizations may draw upon the services of management consultant ...
applied to engineering practice or the engineering sector. This work often deals with large scale complex
business transformation or
Business process management initiatives in aerospace and defence, automotive, oil and gas, machinery, pharmaceutical, food and beverage, electrical & electronics, power distribution & generation, utilities and transportation systems. This combination of technical engineering practice, management consulting practice, industry sector knowledge, and change management expertise enables professional engineers who are also qualified as management consultants to lead major business transformation initiatives. These initiatives are typically sponsored by C-level executives.
Other fields
In
political science
Political science is the scientific study of politics. It is a social science dealing with systems of governance and power, and the analysis of political activities, political thought, political behavior, and associated constitutions and ...
, the term ''engineering'' has been borrowed for the study of the subjects of
social engineering Social engineering may refer to:
* Social engineering (political science), a means of influencing particular attitudes and social behaviors on a large scale
* Social engineering (security), obtaining confidential information by manipulating and/or ...
and
political engineering In political science, political engineering is the designing of political institutions in a society and often involves the use of paper decrees, in the form of laws, referendums, ordinances, or otherwise, to try to achieve some desired effect.
Th ...
, which deal with forming
political
Politics (from , ) is the set of activities that are associated with making decisions in groups, or other forms of power relations among individuals, such as the distribution of resources or status. The branch of social science that studi ...
and
social structures using engineering methodology coupled with
political science
Political science is the scientific study of politics. It is a social science dealing with systems of governance and power, and the analysis of political activities, political thought, political behavior, and associated constitutions and ...
principles.
Marketing engineering and
Financial engineering have similarly borrowed the term.
See also
;Lists
*
List of aerospace engineering topics
This is an alphabetical list of articles pertaining specifically to aerospace engineering. For a broad overview of engineering, see List of engineering topics. For biographies, see List of engineers.
A
* Ablative laser propulsion —
* Absolu ...
*
List of basic chemical engineering topics
*
List of electrical engineering topics
The following outline is provided as an overview of and topical guide to electrical engineering.
Electrical engineering – field of engineering that generally deals with the study and application of electricity, electronics and electromagn ...
*
List of engineering societies
*
List of engineering topics
*
List of engineers
*
List of genetic engineering topics
*
List of mechanical engineering topics
*
List of nanoengineering topics
*
List of software engineering topics
;Glossaries
*
Glossary of areas of mathematics
*
Glossary of biology
*
Glossary of chemistry
*
Glossary of engineering
*
Glossary of physics
;Related subjects
*
Controversies over the term Engineer
*
Design
A design is a plan or specification for the construction of an object or system or for the implementation of an activity or process or the result of that plan or specification in the form of a prototype, product, or process. The verb ''to design'' ...
*
Earthquake engineering
*
Ecotechnology
*
Engineer
Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the l ...
*
Engineering economics
''For the application of engineering economics in the practice of civil engineering see Engineering economics (Civil Engineering).''
Engineering economics, previously known as engineering economy, is a subset of economics concerned with the us ...
*
Engineering education
*
Engineering education research
*
Engineers Without Borders
*
Environmental engineering science
*
Environmental technology
*
Forensic engineering
*
Global Engineering Education
Global Engineering Education is a field of study that focuses on the impact of globalization on the engineering industry.
History
Over the past decade or so educators and researchers have made an effort to transform engineering education in li ...
*
Green engineering
*
Green building
*
Industrial design
*
Infrastructure
*
Mathematics
*
Open-source hardware
*
Planned obsolescence
In economics and industrial design, planned obsolescence (also called built-in obsolescence or premature obsolescence) is a policy of planning or designing a product with an artificially limited useful life or a purposely frail design, so tha ...
*
Reverse engineering
Reverse engineering (also known as backwards engineering or back engineering) is a process or method through which one attempts to understand through deductive reasoning how a previously made device, process, system, or piece of software accompli ...
*
Science
Science is a systematic endeavor that Scientific method, builds and organizes knowledge in the form of Testability, testable explanations and predictions about the universe.
Science may be as old as the human species, and some of the earli ...
*
Structural failure
Structural integrity and failure is an aspect of engineering that deals with the ability of a structure to support a designed structural load (weight, force, etc.) without breaking and includes the study of past structural failures in order t ...
*
Sustainable engineering
*
Technology
Technology is the application of knowledge to reach practical goals in a specifiable and reproducible way. The word ''technology'' may also mean the product of such an endeavor. The use of technology is widely prevalent in medicine, scie ...
*
Women in engineering
References
Further reading
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External links
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{{Authority control
Engineering occupations
Ethics
Philosophy of science
Main topic articles