Energy density is the amount of
energy stored in a given system or region of space per unit
volume, or per unit
mass, depending on the context. In some cases it is obvious from context which quantity is most useful: for example, in
rocketry, energy per unit mass is the most important parameter, but when studying pressurized gas or
magnetohydrodynamics the energy per unit volume is more appropriate. In a few applications (comparing, for example, the effectiveness of
hydrogen fuel to
gasoline) both figures are appropriate and should be called out explicitly. (Hydrogen has a higher energy density per unit mass than does gasoline, but a much lower energy density per unit volume in most applications.)
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The concentration of physiologically releasable energy in a food or group of foods of a specified weight.
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