<Tr> <Td> prototype </Td> <Td> prototype (kilogram / metre) </Td> <Td> 5, 95 </Td> </Tr> <Tr> <Td> noms spéciaux </Td> <Td> (Some derived units have) special names </Td> <Td> 16,106 </Td> </Tr> <Tr> <Td> mise en pratique </Td> <Td> mise en pratique (Practical realisation) </Td> <Td> 82, 171 </Td> </Tr> <P> A French - inspired initiative for international cooperation in metrology led to the signing in 1875 of the Metre Convention also called Treaty of the Metre by 17 nations . Initially the convention only covered standards for the metre and the kilogram . In 1921, the Metre Convention was extended to include all physical units, including the ampere and others thereby enabling the CGPM to address inconsistencies in the way that the metric system had been used . </P>

Having all units in atomic standards is more useful. explain