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The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system and is the most widely used system of measurement, based on the International System of Quantities.


International System of Units (SI), French Système Internationale d’Unités, international decimal system of weights and measures derived from and extending the metric system of units. Adopted by the 11th General Conference on Weights and Measures in 1960, it is abbreviated SI in all languages.


In the meantime, users may refer to the Bureau International des Poids et Mesures (BIPM) website. Now that the 9th edition of the SI Brochure (2019) has been made available, we are in the process of revising SP 330, SP 811, and the contents of this site. Essentials of the SI Introduction SI units and prefixes Units outside the SI


The International System of Units, the SI, is the system of units in which. the unperturbed ground state hyperfine transition frequency of the caesium 133 atom Cs; is 9 192 631 770 Hz, the speed of light in vacuum c is 299 792 458 m/s, the Planck constant h is 6.626 070 15 x 10 –34 J s, the elementary charge e is 1.602 176 634 x 10 –19 C,


The International System of Units is a system of measurement based on 7 base units: the metre (length), kilogram (mass), second (time), ampere (electric current), Kelvin (temperature), mole (quantity), and candela (brightness). These base units can be used in combination with each other.


The International System of Units (abbreviated SI from the French language name Système International d'Unités) is the modern form of the metric system.It is the world's most widely used system of units, both in everyday commerce and in science.. Cover of brochure The International System of Units. The older metric system included several groupings of units.


International System of Units (SI): The International System of Units (abbreviated SI from systeme internationale , the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. There are seven base units in the system, from which other units are derived. This system was ...


International System of Units: The International System of Units (SI) is considered the modern form of the metric system and is now the most widely used system of measurement in the world. It is used both in science and in everyday commerce. The standard was based on the meter-kilogram-second (MKS) system and was published in 1960 as a result ...


The International System of Units (SI) provides definitions of units of measurement that are widely accepted in science and technology and which set measurement standards agreed to through the Convention of the Meter, a diplomatic treaty between fifty-four nations.


1.2 The International System of Units (SI) and the corresponding system of quantities 104 1.3 Dimensions of quantities 105 1.4 Coherent units, derived units with special names, and the SI prefixes 106 1.5 SI units in the framework of general relativity 107 1.6 Units for quantities that describe biological effects 107