它的名字和国际单位中表示基本聚合物质质量千克有关。
The name is a reference to International Prototype kilogram, as a base unit of mass in the International System of Units.
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.
在特定压力和温度条件下某物质单位体积的质量。
The mass per unit volume of a substance under specified conditions of pressure and temperature.
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