Erg (unit)

In science, the erg is an obsolete unit of energy. It is part of the centimeter-gram-second system of units (cgs system) and defined as the work necessary to move a mass over 1 cm against a force of 1 dyne. The SI unit of energy  is the joule (J).
 * 1 erg = 1 dyne cm = 1 g (cm/s)2 = 10&minus;7 kg (m/s)2 = 10&minus;7 J