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.
Volume power density is sometimes an important consideration where space is constrained.
- Energy density, energy per unit volume
- Power-to-weight ratio/specific power, energy per unit mass
- Specific absorption rate (SAR)
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