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。
The mass per unit volume of a substance under specified conditions of pressure and temperature.
在特定压力和温度条件下某物质单位体积的质量。
Because cooler air has a higher density (greater mass per unit volume), cold air intakes generally work by introducing cooler air from outside the hot engine bay.
因为冷气流密度较高(更大的质量单位体积内)，冷空气引入采一般的工作从外面冷空气热引擎湾。
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