From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: For gases the standard substance is hydrogen, at a temperature of 0[deg] Centigrade and a pressure of 760 millimeters. For liquids and solids the standard is water at a temperature of 4[deg] 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.
From WordNet (r) 3.0 (2006) [wn]:
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