Erg

The erg (unit symbol: erg; from gr. ἔργον, ergon, work) is a unit of the CGS system of units for energy. The unit is often used in astrophysics and sometimes in mechanics.

The erg corresponds to the unit joule, which is common in the MKS-based International System of Units (SI), except for a power-of-ten factor:

{\displaystyle {\begin{aligned}1\;\mathrm {erg} &=\mathrm {0{,}1\;\mu J=10^{-7}\;J} \\\Leftrightarrow 10^{7}\;\mathrm {erg} &=1\;\mathrm {J} \end{aligned}}}

A dimensional view of the energy provides as dimension

and therefore in the cgs system the unit

{\displaystyle {\begin{aligned}1\ \mathrm {erg} &=\mathrm {1\ g\cdot \left({\frac {cm}{s}}\right)^{2}} \\&=\mathrm {1\ dyn\cdot \ cm} \end{aligned}}}

with the Dyn.

In Germany, the erg has not been a legal entity since January 1, 1978.


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