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- etimologia
Cosa (chi) è metric system - definizione
![[[Pavillon de Breteuil]], Saint-Cloud, France, the home of the metric system since 1875](https://commons.wikimedia.org/wiki/Special:FilePath/BIPM courtyard.jpg?width=200 "[[Pavillon de Breteuil]], Saint-Cloud, France, the home of the metric system since 1875")
![[[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.](https://commons.wikimedia.org/wiki/Special:FilePath/James Clerk Maxwell.jpg?width=200 "[[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.")
![The [[metre]] was originally defined to be ''one ten millionth'' of the distance between the [[North Pole]] and the [[Equator]] through [[Paris]].<ref name=Alder />](https://commons.wikimedia.org/wiki/Special:FilePath/Kilometre definition.svg?width=200 "The [[metre]] was originally defined to be ''one ten millionth'' of the distance between the [[North Pole]] and the [[Equator]] through [[Paris]].<ref name=Alder />")
Wikipedia
The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the International System of Units (SI) in the mid-20th century, under the oversight of an international standards body. Adopting the metric system is known as metrication.
The historical evolution of metric systems has resulted in the recognition of several principles. Each of the fundamental dimensions of nature is expressed by a single base unit of measure. The definition of base units has increasingly been realised from natural principles, rather than by copies of physical artefacts. For quantities derived from the fundamental base units of the system, units derived from the base units are used—e.g., the square metre is the derived unit for area, a quantity derived from length. These derived units are coherent, which means that they involve only products of powers of the base units, without empirical factors. For any given quantity whose unit has a special name and symbol, an extended set of smaller and larger units is defined that are related by factors of powers of ten. The unit of time should be the second; the unit of length should be either the metre or a decimal multiple of it; and the unit of mass should be the gram or a decimal multiple of it.
Metric systems have evolved since the 1790s, as science and technology have evolved, in providing a single universal measuring system. Before and in addition to the SI, some other examples of metric systems are the following: the MKS system of units and the MKSA systems, which are the direct forerunners of the SI; the centimetre–gram–second (CGS) system and its subtypes, the CGS electrostatic (cgs-esu) system, the CGS electromagnetic (cgs-emu) system, and their still-popular blend, the Gaussian system; the metre–tonne–second (MTS) system; and the gravitational metric systems, which can be based on either the metre or the centimetre, and either the gram(-force) or the kilogram(-force).
The SI has been adopted as the official system of weights and measures by nearly all nations in the world.
