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Part 2 of ISO 80000 specifies the International System of Units (ISU) and the basic units of physical quantities (metre, second, kelvin, candela, ampere, mole, mole per second, kilogram, kilogram per second, kelvin, mole, second, candela). The standard defines and specifies the basic units of physical quantities by reference to the SI units. It also provides guidance for their use. For example, it specifies that the base units of the SI are derived from the basic units of electricity (ampere, coulomb, and volt) and that the metre is the length of the path travelled by light in vacuum over the distance of one complete cycle of a radiation of frequency exactly equal to that of the transition of the caesium-133 atom. In addition, it sets restrictions on the use of the SI units when forming longer units from the basic units.
ISO 80000-1:2009 replaces ISO 31-0:1992 and ISO 1000:1992. It gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities (ISQ) and the International System of Units (SI). The text of the informative sections of this document is publicly available. The standard is an amendment of ISO 80000:1996 and was first published in January 2000 as a technical corrigendum. It consists of the first and second main sections of ISO 80000 and a third section containing new text required by the International Electrotechnical Commission and the international standardisation bodies to be in all languages of the world.
ISO 80000-3:2007 specifies the International System of Quantities (ISQ) as the form in which the quantities named in ISO 80000-1 are expressed and where the relations among the quantities named in ISO 80000-1 are defined. It also specifies that the International System of Quantities (ISQ) is the form in which the quantities and the relations are to be expressed. It states that all languages of the world should now refer to the International System of Quantities (ISQ) rather than to the International System of Units (SI).[41] ISO 80000-3:2007 is a technical corrigendum to ISO 80000-1:2009, and is complementary to ISO 80000-1:2009. 827ec27edc