It is the amount of electric charge per unit volume.
是电荷与体积的比值。
By the charge density we mean the per unit volume.
所谓的电荷密度是指单位体积的电荷。
Field capacity is a property of a unit volume of soil.
野外容水率是单位土体的一种特性。
In physics it is an identification of material by noting its mass per unit volume.
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.
在物理学上，是以每单位体积的质量来鉴别物质。
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