relative density
柯林斯詞典
1. N the ratio of the density of a substance to the density of a standard substance under specified conditions. For liquids and solids the standard is usually water at 4°C or some other specified temperature. For gases the standard is often air or hydrogen at the same temperature and pressure as the substance 相對密度 ( symbol: )→see also specific gravity , vapour density
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relative density
劍橋詞典
- the mass of a particular volume of a substance when compared with the mass of an equal volume of water at 4°C
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