| Power density | |
|---|---|
| SI unit | W/m3 |
| In SI base units | kg·m−1s−3 |
Derivations from other quantities | P/V |
Power density is the amount of power (time rate of energy transfer) per unit volume.[1]
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 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
- Surface power density, energy per unit of area
- Energy density, energy per unit volume
- Specific energy, energy per unit mass
- Power-to-weight ratio/specific power, power per unit mass
- Specific absorption rate (SAR)
References
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