noun
specific energy; gravimetric energy density
Technical term used in engineering and battery technology; refers to energy per unit mass, typically expressed in Wh/kg.
リチウムイオン電池は重量エネルギー密度が高い。
Lithium-ion batteries have high specific energy.
この材料の重量エネルギー密度は200Wh/kgを超える。
The specific energy of this material exceeds 200 Wh/kg.
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'.