SPECIFIC GRAVITY
Jack's Reference Book for Home and Office : An Encyclopaedia of General Information: General Information · 1909 · p. 15
tho ratio of the weight of a given volume of any substance to that of an equal volume of some particular substance taken as the standard. In the cases of gases, Hydrogen is taken as the standard of comparison, and water for liquids and solids. Thus, taking water as unity, the xis gravity of gold is 19°3, that is. gold is 19°3 times as heavy as water, bulk for bulk; or the density of gold is 19°3 times that of water. [s. 285]
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