Power density (or volume power density or volume specific power) is the amount of power (time rate of energy transfer) per unit volume.
In energy transformers like batteries, fuel cells, motors, etc. but also power supply units or similar, power density refers to a volume. It is then also called volume power density which is expressed as W/m3.
Volume power density is sometimes an important consideration where space is constrained.
In reciprocated internal combustion engines, power density- power per swept volume is an important metric.
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“By bourgeoisie is meant the class of modern capitalists, owners of the means of social production and employers of wage labor. By proletariat, the class of modern wage laborers who, having no means of production of their own, are reduced to selling their labor power in order to live.”
—Friedrich Engels (1820–1895)