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Related to specific gravity: Specific weight
The ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water at 4°C (39°F) or of a gas to an equal volume of air or hydrogen under prescribed conditions of temperature and pressure. Also called relative density.
(General Physics) the ratio of the density of a substance to that of water. See relative density
the ratio of the density of any substance to the density of a standard substance, water being the standard for liquids and solids.
1. An amount equal to the density of a solid or liquid divided by the density of an equal volume of water that is at a temperature of 4°C (39°F).
2. An amount equal to the density of a gas divided by the density of an equal volume of air or hydrogen that is at a specified temperature and pressure.