Editing Encyclopedia:Manual of Style (section)

==Units of measurement==
{{Main|Wikipedia:Manual of Style/Dates and numbers#Units of measurement}}
*The main unit in which a quantity is expressed should generally be an [[International System of Units|SI]] unit or [[Non-SI units mentioned in the SI|non-SI unit officially accepted for use with the SI]]. However,
**Scientific articles may also use specialist units appropriate for the branch of science in question.
**In non-scientific articles with strong ties to the United States, the main unit is generally a US customary unit ({{xt|22 pounds (10 kg)}}).
**In non-scientific articles with strong ties to the United Kingdom, although the main unit is generally a metric unit ({{xt|10 kilograms (22 lb)}}), imperial units are still used as the main units in some contexts ({{xt|7 miles (11 km) by road}}).
*Where English-speaking countries use different units for the same measurement, provide a conversion in parentheses. Examples: {{xt|the Mississippi River is {{convert|2320|mi|km|0}} long}}; {{xt|the Murray River is {{convert|2375|km|mi|0}} long}}. See {{tlx|convert}}.
*In a direct quotation, always retain the source's units. Any conversion should follow in square brackets (or, an obscure use of units can be explained in the article text or a [[Wikipedia:Footnotes|footnote]]).
*Where space is limited (such as tables, infoboxes, parenthetical notes, and mathematical formulas) unit symbols are preferred. In prose, unit names should be given in full if used only a few times but symbols may be used when a unit (especially one with a long name) is used repeatedly after spelling out the first use (e.g., {{xt|Up to 15 kilograms of filler is used for a batch of 250{{nbsp}}kg}}), except for unit names that are hardly ever spelled out ({{xt|°C}} rather than {{!xt|degrees Celsius}}).
*Most unit names are not capitalized (see {{section link||National varieties of English}} for spelling differences).
*Use "per" when writing out a unit, rather than a slash: {{xt|metre per second}}, not {{!xt|metre/second}}.
*Units unfamiliar to general readers should be presented as a name–symbol pair on first use, linking the unit name ({{xt|Energies were originally 2.3 [[megaelectronvolt]]s (MeV), but were eventually 6{{nbsp}}MeV}}).
*For ranges, see {{section link||En dashes: other uses}}, and MOS:NUM, at {{section link|nopage=y|Wikipedia:Manual of Style/Dates and numbers|Date ranges|Percentages|Unit names and symbols|Formatting of monetary values}}.
*Unit symbols are preceded by figures, not by spelled-out numbers. Values and unit symbols are separated by a [[non-breaking space]]. For example, {{xt|5&nbsp;min}}. The percent sign and units of degrees, minutes, and seconds {{em|for angles and coordinates}} are unspaced.