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出典:Wiktionary
relative density (countable かつ uncountable, 複数形 relative densities)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/14 12:20 UTC 版)
Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. The term "relative density" is often preferred in modern scientific usage.
Relative density