Relative density

（重定向自Specific density）

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. It is defined as a ratio of density of particular substance with that of water.

单词	Specific density
释义	Specific density 英语百科 Relative density （重定向自Specific density） 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. It is defined as a ratio of density of particular substance with that of water.
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