# Definition:CGS

## Definition

CGS is the centimetre-gram-second standard system of units of measurement.

This system is rarely used nowadays, the SI units having largely taken over.

## CGS Base Units

CGS base units
Name Unit symbol Dimension Symbol
centimetre $\mathrm{cm}$ Length $l$
gram $\mathrm g$ Mass $m$
second $\mathrm s$ Time $t$

## CGS Derived Units

### Dyne

The dyne is the CGS unit of force:

$1 \ \mathrm {dyn} = 1 \ \mathrm g \ \mathrm{cm} \ \mathrm s^{-2}$

## Also known as

The CGS system is also known as the Gaussian system, for Carl Friedrich Gauss.

This term is used usually in the context of atomic physics and solid-state physics, where their scale is more convenient than that of SI units.