specific energy; gravimetric energy density
Technical term used in engineering and battery technology; refers to energy per unit mass, typically expressed in Wh/kg.
Lithium-ion batteries have high specific energy.
The specific energy of this material exceeds 200 watt-hours per kilogram.
Refers to energy per unit volume (volumetric energy density), while 重量エネルギー密度 is energy per unit mass.
General term for energy density; can refer to either gravimetric or volumetric, but 重量エネルギー密度 specifies mass-based.
Compound of 重量 (weight) + エネルギー (energy) + 密度 (density), a direct translation of the English technical term 'gravimetric energy density' or 'specific energy'.