Energy per unit mass, with units such as or . Active-material, cell and packaged-system mass bases can give very different values.
A logarithmic comparison of specific power against specific energy for storage or conversion devices. With consistent mass and energy units, constant-duration lines satisfy . The plotted capability depends on operating conditions and mass convention.
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Specific energy is a term used to describe the amount of energy stored or released per unit mass of a substance or system. It is typically expressed in units such as joules per kilogram (J/kg) or calories per gram (cal/g). Specific energy provides a way to compare the energy content of different materials or fuels regardless of their mass, making it a useful metric in fields such as engineering, chemistry, and physics.