Obsolete CGS unit of work or energy superseded by the SI unit, joule.
An erg is the unit of energy and mechanical work in the centimetre-gram-second (CGS) system of units, symbol "erg".
The erg is a small unit, equal to a force of one dyne exerted for a distance of one centimeter.
1 erg = 10-7 joule
1 joule = 107 ergs
From Greek ergon work [OED]
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