<Li> Cycle per second </Li> <Li> Cycle per metre (This measure of wavenumber became ill - defined due to the abbreviation of "cycle per second" as "cycle".) </Li> <P> In 1901, Giovanni Giorgi proposed to the Associazione elettrotecnica italiana (it) (AEI) that this system, extended with a fourth unit to be taken from the units of electromagnetism, be used as an international system . This system was strongly promoted by electrical engineer George A. Campbell . </P>

The mks (or si) unit of mass is