Energy density Energy density is the amount of energy stored in a given system or region of space per unit volume or mass, though the latter is more accurately termed specific energy. Mechanics QUDT http://qudt.org/vocab/quantity#Energydensity Has identical dimensionality to pressure or stress ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents.