Erg

The erg is a unit of energy equal to 10⁻⁷ joules (100 nJ). It is not an SI unit, instead originating from the 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