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 \(C \cdot m^{-1}\), \(C \cdot m^{-2}\) or \(C \cdot m^{-3}\). (http://qudt.org/schema/qudt/LatexString)