Power density
Power density is the amount of power (time rate of energy transfer) per unit volume.
| Power density | |
|---|---|
| SI unit | W/m3 |
| In SI base units | kg·m−1s−3 |
Derivations from other quantities | P/V |
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.
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 |
gollark: Again, we need something usable by CC here.
gollark: A *CC* client?
gollark: You would have to actually implement SSH on the CC side, so no. Just make it so that CC can send commands.
gollark: Yes, it would be quite easy.
gollark: Too bad, consume bees.
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)
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