所谓的电荷密度是指单位体积的电荷。
一桶液量之单位：许多体积或容量单位的任一个。
测量体积或容积的单位。
在物理学上，是以每单位体积的质量来鉴别物质。
In physics it is an identification of material by noting its mass per unit volume.
每单位体积粉末的质量，包括粒子之间的空气。
Mass per unit of volume in powder form, including the air trapped between the particles.
它因为其大的晶型，单位体积只含有精盐一半的钠。
It has half the sodium of table salt, thanks to its large crystals.
它因为其大的晶型，单位体积只含有精盐一半的钠。
It has half the sodium of table salt, thanks to its large crystals.
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