Editing Ounce (section)

=== Active use ===
==== International avoirdupois ounce ====
The international avoirdupois ounce (abbreviated oz) is defined as exactly 28.349523125&nbsp;g under the [[international yard and pound]] agreement of 1959, signed by the United States and countries of the [[Commonwealth of Nations]].

In the [[avoirdupois]] system, sixteen ounces make up an [[Pound (mass)#Avoirdupois pound|avoirdupois pound]], and the avoirdupois pound is defined as 7000 [[grain (unit)|grains]]; one avoirdupois ounce is therefore equal to 437.5 grains.

The ounce is still a standard unit in the United States. In the United Kingdom it ceased to be an independent unit of measure in 2000,<ref>{{cite web |url=http://www.opsi.gov.uk/si/si1995/Uksi_19951804_en_1.htm |title=The Units of Measurement Regulations 1995 (Article 3) |date=20 September 2000           |access-date=4 October 2022 |quote=the provision shall, unless the context otherwise requires, be construed on or after that date as if the indication of quantity concerned were expressed in the corresponding metric unit.}}</ref> but may still be seen as a general indicator of portion sizes in burger and steak restaurants.

==== International troy ounce ====
{{Main|Troy ounce}}
A [[troy ounce]] (abbreviated oz t) is equal to 480 [[Grain (unit)|grains]].  Consequently, the '''international troy ounce''' is equal to exactly 31.1034768&nbsp;grams.  There are 12 troy ounces in the obsolete [[Pound (mass)#Troy pound|troy pound]].

The troy ounce is used only to express the mass of precious metals such as [[gold]], [[platinum]], [[palladium]], [[rhodium]] or [[silver]]. [[Bullion coin]]s are the most common products marketed in troy ounces, but precious metal bars also exist in gram and kilogram (kg) sizes. (A kilogram bullion bar contains {{convert|1|kg|ozt|sigfig=5|disp=out|abbr=off}}.)

For historical measurement of gold,
* a '''fine ounce''' is a troy ounce of pure gold content in a gold bar, computed as [[fineness]] multiplied by gross weight<ref>{{cite web|last=London Bullion Market Association|title=Market Basics|url=http://www.lbma.org.uk/pages/index.cfm?page_id=17|url-status=dead|archive-url=https://web.archive.org/web/20120308170239/http://www.lbma.org.uk/pages/index.cfm?page_id=17|archive-date=8 March 2012}}</ref>
* a '''standard ounce''' is a troy ounce of 22 [[Carat (purity)|carat]] gold, 91.66% pure (an 11 to 1 proportion of gold to [[alloy]] material)

==== Metric ounces ====
Some countries have redefined their ounces in the [[metric system]].<ref>{{cite book |first1=D. A. |last1=Wittop Koning |first2=G. M. M. |last2=Houben |title=2000 jaar gewichten in de nederlanden|language=nl |publisher=De Tijdstroom |location=Lochem-Poperinge |year=1980 |isbn=9060879651 }} {{in lang|nl}}</ref>  For example, the German apothecaries' ounce of 30 grams is very close to the previously widespread Nuremberg ounce, but the divisions and multiples come out in metric.

In 1820, the Dutch redefined their ounce (in [[Dutch language|Dutch]], ''ons'') as 100 [[gram]]s.  In 1937 the IJkwet of the Netherlands officially abolished the term, but it is still commonly used.<ref>{{cite web|url=http://www.outpostthehague.com/relocations/insideguide/wheretoturn.htm |title=Guide to The Hague – Where to turn |access-date=1 January 2008 |archive-url=https://web.archive.org/web/20080316071124/http://www.outpostthehague.com/relocations/insideguide/wheretoturn.htm |archive-date=16 March 2008 |url-status=dead }}</ref><ref>[[:nl:Nederlands metriek stelsel]]</ref> 
Dutch amendments to the metric system, such as an ''ons'' or 100&nbsp;grams, has been inherited, adopted, and taught in [[Indonesia]] beginning in elementary school. It is also listed as [[Standard language|standard usage]] in Indonesia's national dictionary, the ''[[Kamus Besar Bahasa Indonesia]]'', and the government's official elementary-school curriculum.<ref>{{Cite web |url=https://kbbi.kemdikbud.go.id/entri/ons |title=Ons in KBBI |access-date=12 July 2019 |archive-date=12 July 2019 |archive-url=https://web.archive.org/web/20190712173704/https://kbbi.kemdikbud.go.id/entri/ons |url-status=live }}</ref>