INTERNATIONAL SYSTEM OF UNITS




Int nternational d'Unités) is the modern revision of the metric system.
ernational d'Unités) is the modern revision of the metric system.
 It is the worlThe International System of Units (abbreviated as SI from the French language name Système d's most widely used system of units, both in everyday commerce and in science
. The SI was developed in 1960 from the metre-kilogram-second (MKS) system, rather than the centimetre-gram-second (CGS) system, which, in turn, had many variants
 During its development the SI also introduced several newly named units that were previously not a part of the metric system. The original SI units for the seven basic physical quantities were:[8]
Base quantityBase unitSymbolCurrent SI constantsNew SI constants (proposed)[9]
timesecondshyperfine splitting in caesium-133same as current SI
lengthmetremlength of speed of light in vacuum, csame as current SI
masskilogramkgmass of International Prototype Kilogram (IPK)Planck's constant, h
electric currentampereApermeability of free space, permittivity of free spacecharge of the electron, e
temperaturekelvinKtriple point of water, absolute zeroBoltzmann's constant, k
amount of substancemolemolmolar mass of Carbon-12Avogadro constant NA
luminous intensitycandelacdluminous efficacy of a 540 THz sourcesame as current SI

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