Editing ISO 31 (section)

==Parts==

The standard comes in 14 parts:

*[[ISO 31-0]]:  General principles (replaced by [[ISO/IEC 80000]]-1:2009)
*[[ISO 31-1]]:  [[Space]] and [[time]] (replaced by [[ISO/IEC 80000]]-3:2007)
*[[ISO 31-2]]:  Periodic and related [[phenomena]] (replaced by [[ISO/IEC 80000]]-3:2007)
*[[ISO 31-3]]:  Mechanics (replaced by [[ISO/IEC 80000]]-4:2006)
*[[ISO 31-4]]:  [[Heat]] (replaced by [[ISO/IEC 80000]]-5)
*[[ISO 31-5]]:  [[Electricity]] and [[magnetism]] (replaced by [[ISO/IEC 80000]]-6)
*[[ISO 31-6]]:  [[Light]] and related [[electromagnetic radiation]]s (replaced by [[ISO/IEC 80000]]-7)
*[[ISO 31-7]]:  [[Acoustics]] (replaced by [[ISO/IEC 80000]]-8:2007)
*[[ISO 31-8]]:  Physical [[chemistry]] and [[molecular physics]] (replaced by [[ISO/IEC 80000]]-9)
*[[ISO 31-9]]:  Atomic and [[nuclear physics]]<small></small> (replaced by [[ISO/IEC 80000]]-10)
*[[ISO 31-10]]: [[Nuclear reaction]]s and [[ionizing radiation]]s (replaced by [[ISO/IEC 80000]]-10)
*[[ISO 31-11]]: Mathematical signs and [[symbol]]s for use in the physical sciences and [[technology]] (replaced by [[ISO 80000-2]]:2009)
*[[ISO 31-12]]: [[Characteristic numbers]] (replaced by [[ISO/IEC 80000]]-11)
*[[ISO 31-13]]: [[Solid state physics]] (replaced by [[ISO/IEC 80000]]-12)

A second international standard on quantities and units was [[IEC 60027]].<ref>Tolga, G. O. K. (2016). The importance of symbols and units in natural science. The Eurasia Proceedings of Educational and Social Sciences, 4, 165-167.</ref> The ISO 31 and IEC 60027 Standards were revised by the two standardization organizations in collaboration ([http://www.bipm.org/en/si/si_brochure/chapter1/1-2.html], [https://web.archive.org/web/20090301164428/http://www.iec.ch/zone/si/si_present.htm]) to integrate both standards into a joint standard [[ISO/IEC 80000|''ISO/IEC 80000 - Quantities and Units'']] in which the quantities and equations used with SI are to be referred as the ''International System of Quantities'' (ISQ). ISO/IEC 80000 supersedes both ISO 31 and part of IEC 60027.