absolute gravity

An absolute value of the gravitational acceleration due to the attraction of the Earth's mass, as opposed to its relative values such as measured by conventional gravimeters. It varies from about 9.78 m/sec2 (978,000 mGal) at the equator to about 9.83 m/sec2 (983,000 mGal) at the poles. Measurements are usually made at regional base stations of the world-wide network using the same type instruments. Portable absolute gravimeters are now in use. See also: International Gravity Standardization Net 1971; absolute-gravity instrument.