Metric system
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The metric system is a system of measurement that standardises a set of base units and a nomenclature for describing relatively large and small quantities using decimal-based multiplicative unit prefi
A kilogram mass and three metric measuring devices: a tape measure in centimetres, a thermometer in degrees Celsius, and a multimeter that measures potential in volts, current in amperes and resistance in ohms.
James Clerk Maxwell played a major role in developing the concept of a coherent CGS system and in extending the metric system to include electrical units.
Pavillon de Breteuil, Saint-Cloud, France, the home of the metric system's Mètre des Archives and Kilogramme des Archives since 1875
A coherent system of units is a system of units of measurement used to express physical quantities, that does not use conversion factors in the definitions of its derived units.
Oldest preserved measuring rod, dating to 2650 BC, excavated at Nippur, Mesopotamia, on display in the Archaeology Museum of Istanbul, Turkey. The rod shows the various units of measure in use.