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. Electrical charge volume density In electromagnetism, charge density is a measure of electric charge per unit volume of space, in one, two or three dimensions. More specifically: the linear, surface, or volume charge density is the amount of electric charge per unit length, surface area, or volume, respectively. The respective SI units are C·m?1, C·m?2 or C·m?3. Electricity and Magnetism QUDT http://qudt.org/vocab/quantity#Electricalchargevolumedensity Also https://en.wikipedia.org/wiki/Charge_density