erg
Obsolete CGS unit of work or energy superseded by the SI unit, joule.
Portions of the summary below have been contributed by Wikipedia.
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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