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noun, Physics.
specific gravity.
relative density
the ratio of the density of a substance to the density of a standard substance under specified conditions. For liquids and solids the standard is usually water at 4°C or some other specified temperature. For gases the standard is often air or hydrogen at the same temperature and pressure as the substance d See also specific gravity, vapour density
relative density
The ratio of the density of one substance to that of a reference substance, typically water. See more at specific gravity.


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