It also denotes the ratio of air volume drawn into the cylinder to the cylinder's swept volume. Volumetric efficiency in an internal combustion engine design refers to the efficiency with which the engine can move the charge of fuel and air into and out of the cylinders.
The term is also used in other engineering contexts, such as hydraulic pumps and electronic components. Volumetric efficiency (VE) in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold.
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