ISO 80000 or IEC 80000, Quantities and units, is an international standard describing the International System of Quantities (ISQ). It was developed and...

other parts of the ISO 31 standard. ISO 31-0 was withdrawn on 17 November 2009. It is superseded by ISO 80000-1. Other parts of ISO 31 have also been withdrawn...

and replaced by ISO/IEC 80000. The standard comes in 14 parts: ISO 31-0: General principles (replaced by ISO/IEC 80000-1:2009) ISO 31-1: Space and time...

space and time. It was superseded in 2006 by ISO 80000-3. Its definitions include: Annex A of ISO 31-1 lists units of space and time based on the foot...

quantities. The system is formally described in a multi-part ISO standard ISO/IEC 80000 (which also defines many other quantities used in science and...

root that relates these quantities to power. The term was introduced in ISO 80000-1 § Annex C; it replaces and deprecates the term field quantity. It is...

and technology. It was superseded in 2009 by ISO 80000-2:2009 and subsequently revised in 2019 as ISO-80000-2:2019. Its definitions include the following:...

numerical value and unit, direction or orientation in space. Following ISO 80000-1, any value or magnitude of a physical quantity is expressed as a comparison...

with ISO 31, and are superseded by ISO/IEC 80000. BIPM – publishes freely available information on SI units SI ISO Standards Handbook: Quantities and...

separator between the time element and its fraction. (Following ISO 80000-1 according to ISO 8601:1-2019, it does not stipulate a preference except within International...