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1. Oxford Dictionary

   relative density

   英式

   • 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: relative density, plural noun: relative densities

2. • 更多解釋

   relative density

   • IPA[ˈrelədiv ˈdensədē]

   美式

   • n.
     another term for specific gravity

   Oxford American Dictionary