Den"si*ty(dn"s*t), n. [L. densitas; cf. F. densit.] 1. The quality of being dense, close, or thick; compactness; -- opposed to rarity.
(Physics) The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.
For gases the standard substance is hydrogen, at a temperature of 0 Centigrade and a pressure of 760 millimeters. For liquids and solids the standard is water at a temperature of 4 Centigrade. The density of solids and liquids is usually called specific gravity, and the same is true of gases when referred to air as a standard.
(Photog.) Depth of shade.
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Tue 11th December 2018