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Erg (unit)

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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 = 10−7 kg (m/s)2 = 10−7 J