دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the attraction exerted by the earths mass on objects at its surface. 2. the weight of a body. See API gravity. relative density, specific gravity.

n: the ratio of weight of equal volume of two sunbstances, one of which is taken as a standard. Water is taken as a standard of comparison for liquids and solids ( specific gravity ). For gas, air is usually taken ,although hydrogen is sometimes used.