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The '''International System of Units'''(abbreviated '''SI''' from Resolution ) is the modern form of the metric system, according to a resolution of the International Bureau of Weights and Measures establishing the International System of Unitsis the modern form of the metric system and . It is generally a system of units of measurement devised around seven SI base units and the convenience of the number ten. The older metric system included several groups of units. The SI was established in 1960, based on the metre-kilogram-second system, rather than the Centimetre–gram–second system of units system, which, in turn, had a few variants. The SI is declared as an evolving system, thus prefixes and units are created and unit definitions are modified through international agreement as the technology of measurement progresses, and as the precision of measurements improves.
SI is the world's most widely used system of measurement, which is used both in everyday commerce and in science.Definitions of the basic units can be found at the sites bottom, as well as the [http://physics.nist.gov/cuu/Constants/codata.pdf CODATA report] listing values for special constants such as the electric constant, the magnetic constant and the speed of light, all of which have defined values as a result of the definition of the metre and ampere.
In addition to the SI units, there is also a set of non-SI units accepted for use with SI, which includes some commonly used non-coherent units such as the litre.
[[Category:UBIK|System of units]]
