what is relative density?
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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. ... For example, an ice cube, with a relative density of about 0.91, will float.
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the ratio of density of substance to the density of standard usually water for liquid or solid and air for a gas
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