出典:Wiktionary
charge density (countable かつ uncountable, 複数形 charge densities)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/27 01:21 UTC 版)
The linear, surface, or volume charge density is the amount of electric charge in a line, surface, or volume respectively. It is measured in coulombs per meter (C/m), square meter (C/m²), or cubic meter (C/m³), respectively, and represented by the lowercase Greek letter Rho (ρ). Since there are positive as well as negative charges, the charge density can take on negative values. Like any density it can depend on position. It should not be confused with the charge carrier density. As related to chemistry, it can refer to the charge distribution over the volume of a particle, molecule, or atom. Therefore, a lithium cation will carry a higher charge density than a sodium cation due to its smaller ionic radius.