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Electric Charge Volume Density

Applicable units are those of quantitykind:ElectricChargeVolumeDensity

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://en.wikipedia.org/wiki/Charge_density

$\rho$