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  1. Oxford American Dictionary

    specific gravity

    • IPA[spəˈsifik ˈɡravədē]

    美式

    • n.
      the ratio of the density of a substance to the density of a standard, usually water for a liquid or solid, and air for a gas.

    • noun: specific gravity, plural noun: specific gravities

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    specific gravity

    英式

    • n.
      another term for relative density

    Oxford Dictionary