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mole. amount of substance. cd. candela. luminous intensity. The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance ...
The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. The SI is the dominant measurement system used in science and international commerce. In recognition of this fact, Congress has designated the metric system of measurement as the
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The 1960 International System builds on the MKS system. Its seven basic units, from which other units are derived, were defined as follows: for length, the metre, defined as the distance traveled by light in a vacuum in 1/299,792,458 second; for mass, the kilogram, which equaled 1,000 grams as defined by the international prototype kilogram of platinum-iridium in the keeping of the ...
- The Editors of Encyclopaedia Britannica
- METER (m) Measurement of Length. 1799: The meter is one ten-millionth part of the quadrant of the earth based on a measurement of a meridian between Dunkirk, France and Barcelona, Spain, and represented by a platinum bar where the distance between the polished parallel ends is a meter.
- KILOGRAM (kg) Measurement of Weight. 18th Century: The kilogram is equal to the mass of a cubic decimeter of water. 1889: The kilogram is equal to the mass of the International Prototype of the kilogram.
- SECOND (s) Measurement of Time. Unknown Date: The second is the fraction 1/86,400 of the mean solar day. 1967: The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.
- KELVIN (K) Measurement of Temperature. 1954: The kelvin, the unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Instances in use include the International System of ...
May 29, 2014 · The story of the metric system starts, somewhat unexpectedly, in 17th Century England, with the proposal by the natural philosopher John Wilkins for a consistently decimal system of units. The Europe of his time was divided by the use of innumerable different systems of measure, with each country using its own traditional units (and in many ...
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• represent the world-wide measurement community, aiming to maximize its uptake and impact, • be a centre for scientific and technical collaboration between Member States, providing capabilities for international measurement comparisons on a sharedcost - basis, • be the coordinator of the worldwide measurement system, ensuring it gives-
