Editing System of units of measurement (section)

===Current practice===
{{main article|Metrication}}
Metrication is complete or nearly complete in most countries.

However, [[US customary units]] remain heavily used in the [[United States]] and to some degree in [[Liberia]]. Traditional [[Burmese units of measurement]] are used in [[Burma]], with partial transition to the metric system. U.S. units are used in limited contexts in Canada due to the large volume of trade with the U.S.  There is also considerable use of imperial weights and measures, despite ''de jure'' Canadian conversion to metric.

A number of other jurisdictions have laws mandating or permitting other systems of measurement in some or all contexts, such as the United Kingdom whose [[road signage legislation (UK)|road signage legislation]], for instance, only allows distance signs displaying [[imperial units]] (miles or yards)<ref name=TSRGD>{{cite web
|url = http://www.opsi.gov.uk/si/si2002/20023113.htm
|title = Statutory Instrument 2002 No. 3113 The Traffic Signs Regulations and General Directions 2002
|publisher = Her Majesty's Stationery Office (HMSO)
|year = 2002
|access-date = 18 March 2010}}</ref> or Hong Kong.<ref name="HK">[http://www.legislation.gov.hk/blis_ind.nsf/d2769881999f47b3482564840019d2f9/ca7c0e7895c7f088c82564760077b0c9?OpenDocument HK Weights and Measures Ordinance]</ref>

In the United States, metric units are virtually always used in science, frequently in the military, and partially in industry.  U.S. customary units are primarily used in U.S. households. At retail stores, the litre (spelled 'liter' in the U.S.) is a commonly used unit for volume, especially on bottles of beverages, and milligrams, rather than [[Grain (unit)|grains]], are used for medications. 

Some other non-[[SI]] units are still in international use, such as [[nautical mile]]s and [[knot (unit)|knots]] in aviation and shipping, and [[Foot (unit)|feet]] for aircraft altitude.