. . . "Electric charge per area"@en . "\\(\\sigma\\)"^^ . . . . . . . "http://en.wikipedia.org/wiki/Charge_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 \\cdot m^{-1}\\), \\(C \\cdot m^{-2}\\) or \\(C \\cdot m^{-3}\\)."^^ .