Specific gravity Meaning, Definition & Usage

  1. noun the density of a substance relative to the density of water

WordNet

Definitions
  1. the ratio of the weight of a body to the weight of an equal volume of some other body taken as the standard or unit. This standard is usually water for solids and liquids, and air for gases. Thus, 19, the specific gravity of gold, expresses the fact that, bulk for bulk, gold is nineteen times as heavy as water.
Definitions
  1. . (Physics) See under Gravity.

Webster 1913