The RemoveSystem(system) function removes a system of units.

A system cannot be removed if it is the default system.

$\mathrm{with}\left(\mathrm{Units}\right)\:$

Automatically loading the Units[Simple] subpackage

$\mathrm{AddSystem}\left('\mathrm{FHF}'\,'\mathrm{check}'\,'\mathrm{furlong}'\,'\mathrm{hundredweight}\left[\mathrm{long}\right]'\,'\mathrm{fortnight}'\right)$

$\mathrm{UseSystem}\left('\mathrm{FHF}'\right)$

$\mathrm{RemoveSystem}\left('\mathrm{FHF}'\right)$

Error, (in Units:-RemoveSystem) the system `FHF` of units is currently set to the default (see ?UseSystem)

$\mathrm{UseSystem}\left('\mathrm{SI}'\right)$

$\mathrm{RemoveSystem}\left('\mathrm{FHF}'\right)$

$\mathrm{RemoveSystem}\left('\mathrm{SI}'\right)$

Error, (in Units:-RemoveSystem) the system `SI` of units is currently set to the default (see ?UseSystem)

$\mathrm{RemoveSystem}\left('\mathrm{CGS}'\right)$