Editing International System of Units (section)

=== International System of Quantities ===

{{Main|International System of Quantities}}
The quantities and equations that provide the context in which the SI units are defined are now referred to as the ''[[International System of Quantities]]'' (ISQ).
The ISQ is based on the [[quantity#Quantity in physical science|quantities]] underlying each of the [[SI base units|seven base units of the SI]]. Other quantities, such as [[area]], [[pressure]], and [[electrical resistance]], are derived from these base quantities by clear, non-contradictory equations. The ISQ defines the quantities that are measured with the SI units.<ref>{{cite book |title=International vocabulary of metrology – Basic and general concepts and associated terms (VIM) |date=2012 |publisher=International Bureau of Weights and Measures (BIPM): Joint Committee for Guides in Metrology |edition=3rd |chapter-url=http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2012.pdf |access-date=28 March 2015 |chapter=1.16}}</ref> The ISQ is formalised, in part, in the international standard [[ISO/IEC 80000]], which was completed in 2009 with the publication of [[ISO 80000-1]],<ref>S. V. Gupta, ''Units of Measurement: Past, Present and Future. International System of Units'', p.&nbsp;16, Springer, 2009. {{ISBN|3642007384}}.</ref> and has largely been revised in 2019–2020.<ref>{{Cite web |title=ISO 80000-1:2022 Quantities and units Part 1: General |url=https://www.iso.org/standard/76921.html}}</ref>