4. International System of Units (SI)

The BIPM deals not only with physical measurement standards, but also with the language of a system of units: the International System of Units, designated in all languages by the symbol SI, was adopted by the CGPM in 1960. It is recognized internationally, including by States that are not members of the BIPM.

The SI is defined and presented in the SI Brochure, published by the BIPM . It is based on a choice of seven well-defined base units, conventionally considered to be dimensionally independent: the metre, the kilogram, the second, the ampere, the kelvin, the mole and the candela. Derived units are formed by combining the base units according to the algebraic relationships...