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Gravity feed is the use of
earth's gravity The gravity of Earth, denoted by , is the that is imparted to objects due to the combined effect of (from within ) and the (from the ). In this acceleration is measured in (in symbols, /2 or m·s−2) or equivalently in per (N/kg or N· ...
to move something (usually a
liquid A liquid is a nearly incompressible In fluid mechanics or more generally continuum mechanics, incompressible flow (isochoric process, isochoric flow) refers to a fluid flow, flow in which the material density is constant within a fluid par ...

liquid
) from one place to another. It is a simple means of moving a liquid without the use of a
pump A pump is a device that moves fluids (s or es), or sometimes , by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fl ...

pump
. A common application is the supply of fuel to an
internal combustion engine An internal combustion engine (ICE or IC engine) is a heat engine In thermodynamics Thermodynamics is a branch of physics that deals with heat, Work (thermodynamics), work, and temperature, and their relation to energy, entropy, and ...

internal combustion engine
by placing the fuel tank above the engine, e.g. in
motorcycle A motorcycle, often called a motorbike, bike, cycle, or (if three-wheeled) trike, is a two- or three-wheeled motor vehicle Electric bicycles parked in Yangzhou's main street, Wenchang Lu. They are a very common way of transport in this city ...

motorcycle
s,
lawn mower A lawn mower (also known as a mower, grass cutter or lawnmower) is a machine utilizing one or more revolving blades to cut a grass surface to an even height. The height of the cut grass may be fixed by the design of the mower, but generally is ...

lawn mower
s, etc. A non-liquid application is the carton flow shelving system. Ancient
Roman aqueduct Aerial footage of a Roman provincial aqueduct at Mória ( Lesbos) The Romans Roman or Romans usually refers to: *Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus , image_map ...

Roman aqueduct
s were gravity-fed, as water supply systems to remote villages in developing countries often are. In this case the flow of water to the village is provided by the
hydraulic head Fluid flows from the tank at the top to the basin at the bottom under the pressure of the hydraulic head. Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum A vertical datum, altimetric dat ...

hydraulic head
, the vertical distance from the intake at the source to the outflow in the village, on which gravity acts; while it is opposed by the friction in the pipe which is determined primarily by the length and diameter of the pipe as well as by its age and the material of which it is made.


See also

*
Siphon A siphon (from grc, σίφων, síphōn, "pipe, tube", also spelled nonetymologically syphon) is any of a wide variety of devices that involve the flow of liquids through tubes. In a narrower sense, the word refers particularly to a tube in an ...

Siphon
Gravity
Fluid dynamics Fluid dynamics is a mathematical discipline within continuum mechanics Continuum mechanics is a branch of mechanics Mechanics (Ancient Greek, Greek: ) is the area of physics concerned with the motions of physical objects, more specifically ...
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