International standards Metric system

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seal of international bureau of weights , measures (bipm)


on 20 may 1875 international treaty known convention du mètre (metre convention) signed 17 states. treaty established following organisations conduct international activities relating uniform system measurements:



general conference on weights , measures (cgpm), intergovernmental conference of official delegates of member nations , supreme authority actions;
international committee weights , measures (cipm), consisting of selected scientists , metrologists, prepares , executes decisions of cgpm , responsible supervision of international bureau of weights , measures (bipm);
international bureau of weights , measures (bipm), permanent laboratory , world centre of scientific metrology, activities of include establishment of basic standards , scales of principal physical quantities , maintenance of international prototype standards.

in 1881 first international electrical congress adopted baas recommendations on electrical units, followed series of congresses in further units of measure defined , international electrotechnical commission (iec) set specific task of overseeing electrical units of measure. followed international congress of radiology (isr) who, @ inaugural meeting in 1926, initiated definition of radiological-related units of measure.


in 1921 metre convention extended cover units of measure, not length , mass , in 1933 8th cgpm resolved work other international bodies agree standards electrical units related international prototypes. since 1954 cipm committee oversees definition of units of measurement, consultative committee units, has representatives many international organisations including isr, iec , iso under chairmanship of cipm.





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