Erg (unit)

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The erg is a unit of energy equal to 10−7 joules (100 nJ). It is not an SI unit, instead originating from the older centimetre–gram–second system of units (CGS). Its name is derived from ergon (ἔργον), a Greek word meaning 'work' or 'task'. An erg is the amount of work done by a force of one dyne exerted for a distance of one centimetre. In the CGS base units, it is equal to one gram centimetre-squared per second-squared (g⋅cm2/s2). It is thus equal to 10−7 joules or 100 nanojoules (nJ) in SI units. 1 erg = 10−7 J = 100 nJ 1 erg = 10−10 sn⋅m = 100 psn⋅m = 100 picosthène-metres 1 erg = 624.15 GeV = 6.2415×1011 eV 1 erg = 1 dyn⋅cm = 1 g⋅cm2/s2 1 erg = 2.77778×10−11 W⋅h

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