Astrophysics (Index)About

energy density

(energy per unit volume)

Energy density is the amount of energy stored in a given (unit) volume, e.g., J/m3 (joules per meter cubed). The concept is used in engineering (e.g., batteries) and science, including astrophysics. One use is in radiative transfer models, using density of energy of the electromagnetic radiation passing through a volume at a given time as a term in formulae.

Further reading:

Referenced by pages:
magnetic energy spectrum
radiation era
symmetry breaking
Wien's displacement law