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Density:density is defined asass per unit volume. Relative density: when density of a substance is expressed in comparison with water,it is called relative density.
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Relative density, or specific gravity, is the ratio of thedensity (mass of a unit volume) of a substance to thedensity 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
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