This article consists of tables outlining a number of

physical quantities A physical quantity is a physical property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a ''value'', which is the algebraic multiplication of a ' Numerical value ' and a ' Unit '. For exam ...

. The first table lists the base quantities used in the

International System of Units The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. ...

to define the physical dimension of physical quantities for

dimensional analysis In engineering and science, dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities (such as length, mass, time, and electric current) and units of measure (such as mi ...

. The second table lists the derived physical quantities. Derived quantities can be expressed in terms of the base quantities. Note that neither the names nor the symbols used for the

are international standards. Some quantities are known as several different names such as the magnetic ''B-field'' which known as the ''magnetic flux density'', the ''magnetic induction'' or simply as the ''magnetic field'' depending on the context. Similarly, surface tension can be denoted by either ''σ'', ''γ'' or ''T''. The table usually lists only one name and symbol that is most commonly used. The final column lists some special properties that some of the quantities have, such as their scaling behavior (i.e. whether the quantity is intensive or extensive), their transformation properties (i.e. whether the quantity is a scalar,

vector Vector most often refers to: *Euclidean vector, a quantity with a magnitude and a direction *Vector (epidemiology), an agent that carries and transmits an infectious pathogen into another living organism Vector may also refer to: Mathematic ...

tensor In mathematics, a tensor is an algebraic object that describes a multilinear relationship between sets of algebraic objects related to a vector space. Tensors may map between different objects such as vectors, scalars, and even other tensor ...

), and whether the quantity is conserved. {, class="wikitable sortable" style="width:100%;min-width:95ex;text-align:left" cellspacing="0" cellpadding="3" border="1" align="center" , - ! style="width:18ex" , Derived quantity ! style="width: 5ex" , Symbol ! style="min-width:20ex" , Description ! style="width:30ex" ,

SI derived unit SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate p ...

! style="width:15ex" ,

Dimension In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus, a line has a dimension of one (1D) because only one coord ...

! style="width:25ex" , Comments , - ,

Absement In kinematics, absement (or absition) is a measure of sustained displacement of an object from its initial position, i.e. a measure of how far away and for how long. The word ''absement'' is a portmanteau of the words ''absence'' and ''dis ...

, style="text-align: center" , ''A'' , Measure of sustained displacement: the first integral with respect to time of displacement , m⋅s , style="text-align: center" , L T , vector , - , Absorbed dose rate , ,

Absorbed dose Absorbed dose is a dose quantity which is the measure of the energy deposited in matter by ionizing radiation per unit mass. Absorbed dose is used in the calculation of dose uptake in living tissue in both radiation protection (reduction of har ...

received per unit of time , Gy/s , style="text-align: center" , L² T⁻³ , , - ,

Acceleration In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by ...

, style="text-align: center" , , Rate of change of velocity per unit time: the second time derivative of position , m/s² , style="text-align: center" , L T⁻² , vector , - ,

Action Action may refer to: * Action (narrative), a literary mode * Action fiction, a type of genre fiction * Action game, a genre of video game Film * Action film, a genre of film * ''Action'' (1921 film), a film by John Ford * ''Action'' (1980 fil ...

, style="text-align: center" , ''S'' , Momentum of particle multiplied by distance travelled , J/Hz , style="text-align: center" , L² M T⁻¹ , scalar , - ,

Angular acceleration In physics, angular acceleration refers to the time rate of change of angular velocity. As there are two types of angular velocity, namely spin angular velocity and orbital angular velocity, there are naturally also two types of angular accelera ...

, style="text-align: center" , ''ω''_a , Change in angular velocity per unit time , rad/s² , style="text-align: center" , T⁻² , , - ,

Angular momentum In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational analog of linear momentum. It is an important physical quantity because it is a conserved quantity—the total angular momentum of a closed syst ...

, style="text-align: center" , ''L'' , Measure of the extent and direction of an object rotates about a reference point , kg⋅m²/s , style="text-align: center" , L² M T⁻¹ , conserved, bivector , - ,

Angular velocity In physics, angular velocity or rotational velocity ( or ), also known as angular frequency vector,(UP1) is a pseudovector representation of how fast the angular position or orientation of an object changes with time (i.e. how quickly an object ...

, style="text-align: center" , ''ω'' , The angle incremented in a plane by a segment connecting an object and a reference point per unit time , rad/s , style="text-align: center" , T⁻¹ , bivector , - ,

Area Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while '' surface area'' refers to the area of an op ...

, style="text-align: center" , ''A'' , Extent of a surface , m² , style="text-align: center" , L² , extensive, bivector or scalar , - ,

Area density The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness) of a two-dimensional object is calculated as the mass per unit area. The SI derived unit is ...

, style="text-align: center" , ''ρ''_A , Mass per unit area , kg⋅m⁻² , style="text-align: center" , L⁻² M , intensive , - ,

Capacitance Capacitance is the capability of a material object or device to store electric charge. It is measured by the change in charge in response to a difference in electric potential, expressed as the ratio of those quantities. Commonly recognized are ...

, style="text-align: center" , ''C'' , Stored charge per unit electric potential ,

farad The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI). It is named after the English physicist Michael Faraday (1791–1867). In SI base unit ...

(F = C/V) , style="text-align: center" , L⁻² M⁻¹ T⁴ I² , scalar , - , Catalytic activity concentration , , Change in

reaction rate The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per uni ...

due to presence of a

catalyst Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recyc ...

per unit volume of the system , kat⋅m⁻³ , style="text-align: center" , L⁻³ T⁻¹ N , intensive , - ,

Centrifugal force In Newtonian mechanics, the centrifugal force is an inertial force (also called a "fictitious" or "pseudo" force) that appears to act on all objects when viewed in a rotating frame of reference. It is directed away from an axis which is paralle ...

, style="text-align: center" , ''F''_c , Inertial force that appears to act on all objects when viewed in a

rotating frame of reference A rotating frame of reference is a special case of a non-inertial reference frame that is rotating relative to an inertial reference frame. An everyday example of a rotating reference frame is the surface of the Earth. (This article considers only ...

, N⋅rad = kg⋅m⋅rad⋅s⁻² , style="text-align: center" , L M T⁻² , bivector , - ,

Chemical potential In thermodynamics, the chemical potential of a species is the energy that can be absorbed or released due to a change of the particle number of the given species, e.g. in a chemical reaction or phase transition. The chemical potential of a speci ...

, style="text-align: center" , ''μ'' , Energy per unit change in amount of substance , J/mol , style="text-align: center" , L² M T⁻² N⁻¹ , intensive , - ,

Crackle Crackle or crackling may refer to: Foods * Cracklings, the tissue remaining after lard and tallow have been extracted from animal fats ** Pork rinds in American English, pork scratchings in British English when served in small pieces as a snac ...

, style="text-align: center" , , Change of jounce per unit time: the fifth time derivative of position , m/s⁵ , style="text-align: center" , L T⁻⁵ , vector , - ,

Current density In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional a ...

, style="text-align: center" , , Electric current per unit cross-section area , A/m² , style="text-align: center" , L⁻² I , conserved, intensive, vector , - ,

Dose equivalent Equivalent dose is a dose quantity '' H '' representing the stochastic health effects of low levels of ionizing radiation on the human body which represents the probability of radiation-induced cancer and genetic damage. It is derived from the ...

, style="text-align: center" , ''H'' , Received radiation adjusted for the effect on biological tissue ,

sievert The sievert (symbol: SvNot be confused with the sverdrup or the svedberg, two non-SI units that sometimes use the same symbol.) is a unit in the International System of Units (SI) intended to represent the stochastic health risk of ionizing rad ...

(Sv = m²/s²) , style="text-align: center" , L² T⁻² , intensive , - ,

Dynamic viscosity The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity quantifies the int ...

, style="text-align: center" , , Measure for the resistance of an incompressible fluid to stress , Pa⋅s , style="text-align: center" , L⁻¹ M T⁻¹ , intensive , - ,

Electric charge Electric charge is the physical property of matter that causes charged matter to experience a force when placed in an electromagnetic field. Electric charge can be ''positive'' or ''negative'' (commonly carried by protons and electrons res ...

, style="text-align: center" , ''Q'' , The force per unit electric field strength ,

coulomb The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). In the present version of the SI it is equal to the electric charge delivered by a 1 ampere constant current in 1 second and to elementary char ...

(C = A⋅s) , style="text-align: center" , T I , extensive, conserved , - ,

Electric charge density In electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek letter ρ) is the quantity of charge per unit volume, measured in the SI system in co ...

, style="text-align: center" , ''ρ_Q'' , Electric charge per unit volume , C/m³ , style="text-align: center" , L⁻³ T I , intensive , - ,

Electric dipole moment The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity. The SI unit for electric dipole moment is the coulomb- meter (C⋅m). ...

, style="text-align: center" , ''p'' , Measure of the separation of equal and opposite electric charges , C⋅m , style="text-align: center" , L T I , vector , - ,

Electric displacement field In physics, the electric displacement field (denoted by D) or electric induction is a vector field that appears in Maxwell's equations. It accounts for the effects of free and bound charge within materials. "D" stands for "displacement", as in ...

, style="text-align: center" , , Strength of the electric displacement , C/m² , style="text-align: center" , L⁻² T I , vector field , - , Electric field strength , style="text-align: center" , , Strength of the electric field , V/m, N/C , style="text-align: center" , L M T⁻³ I⁻¹ , vector field , - ,

Electrical conductance The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is , measuring the ease with which an electric current passes. Electrical resistance shares some conceptual parallel ...

, style="text-align: center" , ''G'' , Measure for how easily current flows through a material ,

siemens Siemens AG ( ) is a German multinational conglomerate corporation and the largest industrial manufacturing company in Europe headquartered in Munich with branch offices abroad. The principal divisions of the corporation are ''Industry'', ''E ...

(S = Ω⁻¹) , style="text-align: center" , L⁻² M⁻¹ T³ I² , scalar , - ,

Electrical conductivity Electrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current. A low resistivity indicates a material that readily allows ...

, style="text-align: center" , '' σ'' , Measure of a material's ability to conduct an electric current , S/m , style="text-align: center" , L⁻³ M⁻¹ T³ I² , scalar , - ,

Electric potential The electric potential (also called the ''electric field potential'', potential drop, the electrostatic potential) is defined as the amount of work energy needed to move a unit of electric charge from a reference point to the specific point in ...

, style="text-align: center" , ''φ'' , Energy required to move a unit charge through an electric field from a reference point ,

volt The volt (symbol: V) is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). It is named after the Italian physicist Alessandro Volta (1745–1827). Defin ...

(V = J/C) , style="text-align: center" , L² M T⁻³ I⁻¹ , extensive, scalar , - ,

Electrical resistance The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is , measuring the ease with which an electric current passes. Electrical resistance shares some conceptual parallel ...

, style="text-align: center" , ''R'' , Electric potential per unit electric current ,

ohm Ohm (symbol Ω) is a unit of electrical resistance named after Georg Ohm. Ohm or OHM may also refer to: People * Georg Ohm (1789–1854), German physicist and namesake of the term ''ohm'' * Germán Ohm (born 1936), Mexican boxer * Jörg Ohm (bor ...

(Ω = V/A) , style="text-align: center" , L² M T⁻³ I⁻² , extensive, scalar, assumes linearity , - ,

Electrical resistivity Electrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current. A low resistivity indicates a material that readily allows ...

, style="text-align: center" , ''ρ''_e , Bulk property equivalent of electrical resistance ,

metre The metre ( British spelling) or meter ( American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pre ...

(Ω⋅m) , style="text-align: center" , L³ M T⁻³ I⁻² , extensive, scalar, conserved , - ,

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 ...

, style="text-align: center" , ''E'' , Energy , J , style="text-align: center" , L² M T⁻² , , - ,

Energy density In physics, energy density is the amount of energy stored in a given system or region of space per unit volume. It is sometimes confused with energy per unit mass which is properly called specific energy or . Often only the ''useful'' or extrac ...

, style="text-align: center" , ''ρ''_E , Energy per unit volume , J⋅m⁻³ , style="text-align: center" , L⁻¹ M T⁻² , intensive , - ,

Entropy Entropy is a scientific concept, as well as a measurable physical property, that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodyna ...

, style="text-align: center" , ''S'' , Logarithmic measure of the number of available states of a system , J/K , style="text-align: center" , L² M T⁻² Θ⁻¹ , extensive, scalar , - ,

Force In physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a ...

, style="text-align: center" , , Transfer of momentum per unit time , newton (N = kg⋅m⋅s⁻²) , style="text-align: center" , L M T⁻² , extensive, vector , - ,

Frequency Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from ''angular frequency''. Frequency is measured in hertz (Hz) which is eq ...

, style="text-align: center" , ''f'' , Number of (periodic) occurrences per unit time ,

hertz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that o ...

(Hz = s⁻¹) , style="text-align: center" , T⁻¹ , scalar , - ,

Half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable ...

, style="text-align: center" , ''t''_1/2 , Time for a quantity to decay to half its initial value , s , style="text-align: center" , T , , - ,

Heat In thermodynamics, heat is defined as the form of energy crossing the boundary of a thermodynamic system by virtue of a temperature difference across the boundary. A thermodynamic system does not ''contain'' heat. Nevertheless, the term is ...

, style="text-align: center" , ''Q'' ,

Thermal energy The term "thermal energy" is used loosely in various contexts in physics and engineering. It can refer to several different well-defined physical concepts. These include the internal energy or enthalpy of a body of matter and radiation; heat, de ...

joule The joule ( , ; symbol: J) is the unit of energy in the International System of Units (SI). It is equal to the amount of work done when a force of 1 newton displaces a mass through a distance of 1 metre in the direction of the force appli ...

(J) , style="text-align: center" , L² M T⁻² , , - ,

Heat capacity Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature. The SI unit of heat capacity is joule per kelvin (J/K). Heat cap ...

, style="text-align: center" , ''C_p'' , Energy per unit temperature change , J/K , style="text-align: center" , L² M T⁻² Θ⁻¹ , extensive , - , Heat flux density , style="text-align: center" , ''ϕ_Q'' , Heat flow per unit time per unit surface area , W/m² , style="text-align: center" , M T⁻³ , , - , Illuminance , style="text-align: center" , ''E''_v , Wavelength-weighted luminous flux per unit surface area ,

lux The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by ...

(lx = cd⋅sr/m²) , style="text-align: center" , L⁻² J , , - , Impedance , style="text-align: center" , ''Z'' , Resistance to an alternating current of a given frequency, including effect on phase ,

(Ω) , style="text-align: center" , L² M T⁻³ I⁻² , complex scalar , - ,

Impulse Impulse or Impulsive may refer to: Science * Impulse (physics), in mechanics, the change of momentum of an object; the integral of a force with respect to time * Impulse noise (disambiguation) * Specific impulse, the change in momentum per uni ...

, style="text-align: center" , ''J'' , Transferred momentum ,

newton-second The newton-second (also newton second; symbol: N⋅s or N s) is the unit of impulse in the International System of Units (SI). It is dimensionally equivalent to the momentum unit kilogram-metre per second (kg⋅m/s). One newton-secon ...

(N⋅s = kg⋅m/s) , style="text-align: center" , L M T⁻¹ , vector , - ,

Inductance Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The flow of electric current creates a magnetic field around the conductor. The field strength depends on the magnitude of th ...

, style="text-align: center" , ''L'' , Magnetic flux generated per unit current through a circuit , henry (H) , style="text-align: center" , L² M T⁻² I⁻² , scalar , - ,

Irradiance In radiometry, irradiance is the radiant flux ''received'' by a ''surface'' per unit area. The SI unit of irradiance is the watt per square metre (W⋅m−2). The CGS unit erg per square centimetre per second (erg⋅cm−2⋅s−1) is often used ...

, style="text-align: center" , ''E'' , Electromagnetic radiation power per unit surface area , W/m² , style="text-align: center" , M T⁻³ , intensive , - , Intensity , style="text-align: center" , ''I'' , Power per unit cross sectional area , W/m² , style="text-align: center" , M T⁻³ , intensive , - , Jerk , style="text-align: center" , , Change of acceleration per unit time: the third time derivative of position , m/s³ , style="text-align: center" , L T⁻³ , vector , - ,

Jounce In physics, the fourth, fifth and sixth derivatives of position are defined as derivatives of the position vector with respect to time – with the first, second, and third derivatives being velocity, acceleration, and jerk, respectively. Unlike ...

(or ''snap'') , style="text-align: center" , , Change of jerk per unit time: the fourth time derivative of position , m/s⁴ , style="text-align: center" , L T⁻⁴ , vector , - , Linear density , style="text-align: center" , ''ρ''_l , Mass per unit length , kg⋅m⁻¹ , style="text-align: center" , L⁻¹ M , , - ,

Luminous flux In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light), in tha ...

(or ''luminous power'') , style="text-align: center" , ''F'' , Perceived power of a light source , lumen (lm = cd⋅sr) , style="text-align: center" , J , , - ,

Mach number Mach number (M or Ma) (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after the Moravian physicist and philosopher Ernst Mach. : \mathrm = \f ...

(or ''mach'') , style="text-align: center" , ''M'' , Ratio of flow velocity to the local speed of sound ,

unitless A dimensionless quantity (also known as a bare quantity, pure quantity, or scalar quantity as well as quantity of dimension one) is a quantity to which no physical dimension is assigned, with a corresponding SI unit of measurement of one (or 1) ...

, style="text-align: center" , 1 , , - , Magnetic field strength , style="text-align: center" , ''H'' , Strength of a magnetic field , A/m , style="text-align: center" , L⁻¹ I , vector field , - ,

Magnetic flux In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface. It is usually denoted or . The SI unit of magnetic flux is the weber ...

, style="text-align: center" , ''Φ'' , Measure of

magnetism Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomena in other entities. Electric currents and the magnetic moments of elementary particles ...

, taking account of the strength and the extent of a

magnetic field A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to ...

weber Weber (, or ; German: ) is a surname of German origin, derived from the noun meaning " weaver". In some cases, following migration to English-speaking countries, it has been anglicised to the English surname 'Webber' or even 'Weaver'. Notable pe ...

(Wb) , style="text-align: center" , L² M T⁻² I⁻¹ , scalar , - ,

Magnetic flux density A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to ...

, style="text-align: center" , ''B'' , Measure for the strength of the magnetic field , tesla (T = Wb/m²) , style="text-align: center" , M T⁻² I⁻¹ , pseudovector field , - ,

Magnetization In classical electromagnetism, magnetization is the vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material. Movement within this field is described by direction and is either Axial or D ...

, style="text-align: center" , ''M'' , Amount of magnetic moment per unit volume , A/m , style="text-align: center" , L⁻¹ I , vector field , - , Mass fraction , style="text-align: center" , ''x'' , Mass of a substance as a fraction of the total mass , kg/kg , style="text-align: center" , 1 , intensive , - , (Mass) Density (or ''volume density'') , style="text-align: center" , ''ρ'' , Mass per unit volume , kg/m³ , style="text-align: center" , L⁻³ M , intensive , - ,

Mean lifetime A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where is the quantity and ( lambda) is a positive rate ...

, style="text-align: center" , '' τ'' , Average time for a particle of a substance to decay , s , style="text-align: center" , T , intensive , - ,

Molar concentration Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of sol ...

, style="text-align: center" , ''C'' , Amount of substance per unit volume , mol⋅m⁻³ , style="text-align: center" , L⁻³ N , intensive , - ,

Molar energy The joule per mole (symbol: J·mol−1 or J/mol) is the unit of energy per amount of substance in the International System of Units (SI), such that energy is measured in joules, and the amount of substance is measured in moles. It is also a ...

, , Amount of energy present in a system per unit amount of substance , J/mol , style="text-align: center" , L² M T⁻² N⁻¹ , intensive , - , Molar entropy , , Entropy per unit amount of substance , J/(K⋅mol) , style="text-align: center" , L² M T⁻² Θ⁻¹ N⁻¹ , intensive , - , Molar heat capacity , style="text-align: center" , ''c'' , Heat capacity of a material per unit amount of substance , J/(K⋅mol) , style="text-align: center" , L² M T⁻² Θ⁻¹ N⁻¹ , intensive , - ,

Moment of inertia The moment of inertia, otherwise known as the mass moment of inertia, angular mass, second moment of mass, or most accurately, rotational inertia, of a rigid body is a quantity that determines the torque needed for a desired angular accele ...

, style="text-align: center" , ''I'' , Inertia of an object with respect to angular acceleration , kg⋅m² , style="text-align: center" , L² M , extensive, tensor, scalar , - ,

Momentum In Newtonian mechanics, momentum (more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If is an object's mass ...

, style="text-align: center" , , Product of an object's mass and velocity , kg⋅m/s , style="text-align: center" , L M T⁻¹ , vector, extensive , - ,

Optical power In optics, optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the ...

, style="text-align: center" , ''P'' , Measure of the effective curvature of a lens or curved mirror; inverse of

focal length The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative foc ...

dioptre A dioptre (British spelling) or diopter (American spelling) is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dioptre = 1 m−1. It is normally used to express the optical power of a lens or ...

(dpt = m⁻¹) , style="text-align: center" , L⁻¹ , , - , Permeability , style="text-align: center" , ''μ_s'' , Measure for how the magnetization of material is affected by the application of an external magnetic field , H/m , style="text-align: center" , L M T⁻² I⁻² , intensive , - ,

Permittivity In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ''ε'' (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in ...

, style="text-align: center" , ''ε_s'' , Measure for how the polarization of a material is affected by the application of an external electric field , F/m , style="text-align: center" , L⁻³ M⁻¹ T⁴ I² , intensive , - ,

Plane angle In Euclidean geometry, an angle is the figure formed by two rays, called the '' sides'' of the angle, sharing a common endpoint, called the ''vertex'' of the angle. Angles formed by two rays lie in the plane that contains the rays. Angles a ...

, style="text-align: center" , ''θ'' , Ratio of circular arc length to radius ,

radian The radian, denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. The unit was formerly an SI supplementary unit (before that ...

(rad) , style="text-align: center" , 1 , , - ,

Power Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may a ...

, style="text-align: center" , ''P'' , Rate of transfer of energy per unit time ,

watt The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James ...

(W) , style="text-align: center" , L² M T⁻³ , extensive, scalar , - ,

Pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country a ...

, style="text-align: center" , ''p'' , Force per unit area ,

pascal Pascal, Pascal's or PASCAL may refer to: People and fictional characters * Pascal (given name), including a list of people with the name * Pascal (surname), including a list of people and fictional characters with the name ** Blaise Pascal, Frenc ...

(Pa = N/m²) , style="text-align: center" , L⁻¹ M T⁻² , intensive, scalar , - ,

Pop Pop or POP may refer to: Arts, entertainment, and media Music * Pop music, a musical genre Artists * POP, a Japanese idol group now known as Gang Parade * Pop!, a UK pop group * Pop! featuring Angie Hart, an Australian band Albums * ''Pop'' ( ...

, style="text-align: center" , , Rate of change of crackle per unit time: the sixth time derivative of position , m/s⁶ , style="text-align: center" , L T⁻⁶ , vector , - , (Radioactive) Activity , style="text-align: center" , ''A'' , Number of particles decaying per unit time ,

becquerel The becquerel (; symbol: Bq) is the unit of radioactivity in the International System of Units (SI). One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. For applications relatin ...

(Bq = Hz) , style="text-align: center" , T⁻¹ , extensive, scalar , - , (Radioactive) Dose , style="text-align: center" , ''D'' , Ionizing radiation energy absorbed by biological tissue per unit mass ,

gray Grey (more common in British English) or gray (more common in American English) is an intermediate color between black and white. It is a neutral or achromatic color, meaning literally that it is "without color", because it can be compose ...

(Gy = m²/s²) , style="text-align: center" , L² T⁻² , , - ,

Radiance In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiati ...

, style="text-align: center" , ''L'' , Power of emitted electromagnetic radiation per unit solid angle per emitting source area , W/(m²⋅sr) , style="text-align: center" , M T⁻³ , , - , Radiant intensity , style="text-align: center" , ''I'' , Power of emitted electromagnetic radiation per unit solid angle , W/sr , style="text-align: center" , L² M T⁻³ , scalar , - ,

Reaction rate The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per uni ...

, style="text-align: center" , ''r'' , Rate of a chemical reaction for unit time , mol/(m³⋅s) , style="text-align: center" , L⁻³ T⁻¹ N , intensive, scalar , - ,

Refractive index In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, ...

, style="text-align: center" , ''n'' , Factor by which the

phase velocity The phase velocity of a wave is the rate at which the wave propagates in any medium. This is the velocity at which the phase of any one frequency component of the wave travels. For such a component, any given phase of the wave (for example, ...

of light is reduced in a medium , unitless , style="text-align: center" , 1 , intensive, scalar , - , Reluctance , style="text-align: center" ,

\mathcal{R}

, resistance to the flow of magnetic flux , H⁻¹ , style="text-align: center" , L⁻² M⁻¹ T² I² , scalar , - ,

Solid angle In geometry, a solid angle (symbol: ) is a measure of the amount of the field of view from some particular point that a given object covers. That is, it is a measure of how large the object appears to an observer looking from that point. The poi ...

, style="text-align: center" , ''Ω'' , Ratio of area on a sphere to its radius squared ,

steradian The steradian (symbol: sr) or square radian is the unit of solid angle in the International System of Units (SI). It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles. Whereas an angle in radian ...

(sr) , style="text-align: center" , 1 , , - , Specific energy , , Energy density per unit mass , J⋅kg⁻¹ , style="text-align: center" , L² T⁻² , intensive , - ,

Specific heat capacity In thermodynamics, the specific heat capacity (symbol ) of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capacity. Informally, it is the amount of heat t ...

, style="text-align: center" , ''c'' , Heat capacity per unit mass , J/(K⋅kg) , style="text-align: center" , L² T⁻² Θ⁻¹ , intensive , - ,

Specific volume In thermodynamics, the specific volume of a substance (symbol: , nu) is an intrinsic property of the substance, defined as the ratio of the substance's volume () to its mass (). It is the reciprocal of density (rho) and it is related to the m ...

, style="text-align: center" , ''v'' , Volume per unit mass (reciprocal of density) , m³⋅kg⁻¹ , style="text-align: center" , L³ M⁻¹ , intensive , - ,

Spin Spin or spinning most often refers to: * Spinning (textiles), the creation of yarn or thread by twisting fibers together, traditionally by hand spinning * Spin, the rotation of an object around a central axis * Spin (propaganda), an intentionally ...

, style="text-align: center" , ''S'' , Quantum-mechanically defined

angular momentum In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational analog of linear momentum. It is an important physical quantity because it is a conserved quantity—the total angular momentum of a closed syst ...

of a particle , kg⋅m²⋅s⁻¹ , style="text-align: center" , L² M T⁻¹ , , - , Strain , style="text-align: center" , ''ε'' , Extension per unit length , unitless , style="text-align: center" , 1 , , - ,

Stress Stress may refer to: Science and medicine * Stress (biology), an organism's response to a stressor such as an environmental condition * Stress (linguistics), relative emphasis or prominence given to a syllable in a word, or to a word in a phrase ...

, style="text-align: center" , ''σ'' , Force per unit oriented surface area , Pa , style="text-align: center" , L⁻¹ M T⁻² , order 2 tensor , - ,

Surface tension Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) t ...

, style="text-align: center" , ''γ'' , Energy change per unit change in surface area , N/m or J/m² , style="text-align: center" , M T⁻² , , - ,

Temperature gradient A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location. The temperature gradient is a dimensional quantity expressed in units of degre ...

, style="text-align: center" , ''

\nabla T

'' , steepest rate of temperature change at a particular location , K/m , style="text-align: center" , L⁻¹ Θ , vector , - , Thermal conductance , style="text-align: center" , , Measure for the ease with which an object conducts heat , W/K , style="text-align: center" , L² M T⁻³ Θ⁻¹ , extensive , - ,

Thermal conductivity The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by k, \lambda, or \kappa. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal ...

, style="text-align: center" , ''λ'' , Measure for the ease with which a material conducts heat , W/(m⋅K) , style="text-align: center" , L M T⁻³ Θ⁻¹ , intensive , - , Thermal resistance , style="text-align: center" , ''R'' , Measure for the ease with which an object resists conduction of heat , K/W , style="text-align: center" , L⁻² M⁻¹ T³ Θ , extensive , - , Thermal resistivity , style="text-align: center" , ''R_λ'' , Measure for the ease with which a material resists conduction of heat , K⋅m/W , style="text-align: center" , L⁻¹ M⁻¹ T³ Θ , intensive , - ,

Torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...

, style="text-align: center" , ''τ'' , Product of a force and the perpendicular distance of the force from the point about which it is exerted , newton-metre (N⋅m) , style="text-align: center" , L² M T⁻² , bivector (or pseudovector in 3D) , - ,

Velocity Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. northbound). Velocity i ...

, style="text-align: center" , , Moved distance per unit time: the first time derivative of position , m/s , style="text-align: center" , L T⁻¹ , vector , - ,

Volume Volume is a measure of occupied three-dimensional space. It is often quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart, cubic inch). ...

, style="text-align: center" , ''V'' , Three dimensional extent of an object , m³ , style="text-align: center" , L³ , extensive, scalar , - ,

Volumetric flow rate In physics and engineering, in particular fluid dynamics, the volumetric flow rate (also known as volume flow rate, or volume velocity) is the volume of fluid which passes per unit time; usually it is represented by the symbol (sometimes ). I ...

, style="text-align: center" , ''Q'' , Rate of change of volume with respect to time , m³⋅s⁻¹ , style="text-align: center" , L³ T⁻¹ , extensive, scalar , - ,

Wavelength In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, tr ...

, style="text-align: center" , ''λ'' , Perpendicular distance between repeating units of a wave , m , style="text-align: center" , L , , - ,

Wavenumber In the physical sciences, the wavenumber (also wave number or repetency) is the '' spatial frequency'' of a wave, measured in cycles per unit distance (ordinary wavenumber) or radians per unit distance (angular wavenumber). It is analogous to te ...

, style="text-align: center" , ''k'' , Repetency or spatial frequency: the number of cycles per unit distance , m⁻¹ , style="text-align: center" , L⁻¹ , scalar , - ,

Wavevector In physics, a wave vector (or wavevector) is a vector used in describing a wave, with a typical unit being cycle per metre. It has a magnitude and direction. Its magnitude is the wavenumber of the wave (inversely proportional to the wavelength), ...

, style="text-align: center" , {{math, {{vec, ''k'' , Repetency or spatial frequency vector: the number of cycles per unit distance , m⁻¹ , style="text-align: center" , L⁻¹ , vector , - ,

Weight In science and engineering, the weight of an object is the force acting on the object due to gravity. Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object. Others define weight as a scalar qua ...

, style="text-align: center" , ''w'' , Gravitational force on an object , newton (N = kg⋅m/s²) , style="text-align: center" , L M T⁻² , vector , - ,

Work Work may refer to: * Work (human activity), intentional activity people perform to support themselves, others, or the community ** Manual labour, physical work done by humans ** House work, housework, or homemaking ** Working animal, an animal t ...

, style="text-align: center" , ''W'' , Transferred energy ,

(J) , style="text-align: center" , L² M T⁻² , scalar , - ,

Young's modulus Young's modulus E, the Young modulus, or the modulus of elasticity in tension or compression (i.e., negative tension), is a mechanical property that measures the tensile or compressive stiffness of a solid material when the force is applied ...

, style="text-align: center" , ''E'' , Ratio of stress to strain ,

(Pa = N/m²) , style="text-align: center" , L⁻¹ M T⁻² , scalar; assumes isotropic linear material

See also