Astrophysics (index)

Energy Density

(energy per unit volume at a point in a field)

Energy Density is the amount of energy stored in a given (unit) volume, e.g., J/m3 (Joules per meter cubed). The concept has a lot of use in engineering (e.g., batteries) and science, including astrophysics: often the calculation of the energy in a system provides a way to model its behavior. One use is in Radiative Transfer (RT) models, such as using the density of energy of the Electromagnetic Radiation (EMR) passing through a volume.


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