Power density

Power density is the amount of power (time rate of energy transfer) per unit volume.[1]

This article is about power per volume. For power per unit mass, see Power-to-weight ratio. For power per area, see Surface power density. For power per frenquency, see Power spectral density.
Power density
SI unitW/m3
In SI base unitskg·m−1s−3
Derivations from
other quantities
P/V

In energy transformers including batteries, fuel cells, motors, power supply units etc., power density refers to a volume, where it is often called volume power density, expressed as W/m3.

In reciprocating internal combustion engines, power density (power per swept volume or brake horsepower per cubic centimeter) is an important metric, based on the internal capacity of the engine, not its external size.

Examples
Storage materialEnergy typeSpecific power (W/kg)Power density (W/m3)
Hydrogen (in star)Stellar fusion0.00184276.5
PlutoniumAlpha decay1.9438,360
Supercapacitors Capacitance up to 15000 Variable
Lithium-ion Chemical ~250–350 ~700

See also

References
  1. Jelley, N. A. (Nicholas Alfred), 1946-. A dictionary of energy science. Oxford. ISBN 978-0-19-182627-6. OCLC 970401289.{{cite book}}: CS1 maint: multiple names: authors list (link)


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