Jisho

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Noun
1. specific gravity; relative densityPhysics
Noun
2. relative importance; weight
Wikipedia definition
3. Relative densityRelative 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. If a substance's relative density is less than one then it is less dense than the reference; if greater than 1 then it is denser than the reference.
Read “Relative density” on English Wikipedia
Read “比重” on Japanese Wikipedia
Read “Relative density” on DBpedia

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