Power Density
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Power Density
Power density
SI unitW/m3
In SI base unitskg·m-1s-3
Derivations from
other quantities

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

In energy transformers including batteries, fuel cells, motors, etc., and 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.

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


Storage material Energy type Specific power (W/kg) Power density (W/m3)
Hydrogen (in star) Stellar fusion 0.00184 276.5
Plutonium Alpha decay 1.94 38,360
Supercapacitors Capacitance up to 15000 Variable
Lithium-Ion Chemical ~250-350 ~700

See also


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

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