دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the ratio of the weight of a given volume of a substance at a given temperature to the weight of an equal volume of a standard substance at the same temperature. For example, if 1 cubic inch of water at 39�F (3.9�C) weighs 1 unit and 1 cubic inch of another solid or liquid at 39�F weighs 0.95 unit. then the relative density of the substance is 0.95. In determin- ing the relative density of gases, the comparison is made with the standard of air or hydrogen. 2. the ratio of the mass of a given volume of a substance to the mass of a like volume of a standard substance, such as water or air.