| erg [ǝrg] GEOGRAPHY A large expanse of the earth's surface that is covered with sand, generally blown by wind into dune formations. PHYSICS A unit of energy or work in the centimeter-gram-second system of units, equal to the work done by a force of magnitude of 1 dyne when the point at which the force is applied is displaced 1 centimeter in the direction of the force. Also known as dyne centimeter (dyne-cm). |