<P> The system was published in 1960 as a result of an initiative that began in 1948 . It is based on the metre -- kilogram -- second system of units ( MKS ) rather than any variant of the centimetre -- gram -- second system of units ( CGS ) . SI is intended to be an evolving system , so prefixes and units are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves . The 24th and 25th General Conferences on Weights and Measures ( CGPM ) in 2011 and 2014 , for example , discussed a proposal to change the definition of the kilogram , linking it to an invariant of nature rather than to the mass of a material artefact , thereby ensuring long - term stability . </P>
<P> The system was published in 1960 as a result of an initiative that began in 1948 . It is based on the metre -- kilogram -- second system of units ( MKS ) rather than any variant of the centimetre -- gram -- second system of units ( CGS ) . SI is intended to be an evolving system , so prefixes and units are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves . The 24th and 25th General Conferences on Weights and Measures ( CGPM ) in 2011 and 2014 , for example , discussed a proposal to change the definition of the kilogram , linking it to an invariant of nature rather than to the mass of a material artefact , thereby ensuring long - term stability . </P>
which of the following is si based on
which of the following is si based on
metre -- kilogram -- second system of units ( MKS )
metre -- kilogram -- second system of units ( MKS )