specific gravity (sp. gr.) The ratio of the weight of a substance to the weight of an equal volume of water, expressed as a number. For example, the weight of a given volume of quartz, with a specific gravity of 2.65, is 2.65 times that of the same volume of water. The average sp. gr. of metallic minerals is about 5. See also DENSITY.
specific gravity (grav-iti) n. see relative density.
specific gravity (sp. gr.) See relative density (r.d.)
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