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| Line 600: |
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| * {{xt|133 cm }} | | * {{xt|133 cm }} |
| |{{!xt|1 m 33 cm}} | | |{{!xt|1 m 33 cm}} |
| |}
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|
| |
| ===Specific units===
| |
| * The following table lists only units that need special attention.
| |
| * The SI Brochure<ref name="SI Brochure" /> should be consulted for guidance on use of other SI and non-SI units.
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|
| |
| {|class="wikitable"
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| |+ Guidelines on specific units
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| |-
| |
| ! style="width:40px;"<!--undersized width specification means that column size is set by widest word/nobreaked phrase in column contents-->| Group
| |
| ! style="width:40px;"<!--undersized width specification means that column size is set by widest word/nobreaked phrase in column contents-->| Name
| |
| ! style="width:40px;"<!--undersized width specification means that column size is set by widest word/nobreaked phrase in column contents-->| Symbol
| |
| ! Comment<!--this column picks up whatever width is left over from other columns-->
| |
| |-
| |
| | rowspan = 11 | '''Length''',<br />'''Speed'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS -->
| |
| | inch
| |
| | {{ xt|in}}
| |
| | rowspan=2|Do not use <code>&prime;</code>{{nbsp}}({{!xt|′}}), <code>&Prime;</code>{{nbsp}}({{!xt|″}}), apostrophe{{nbsp}}({{!xt|'}}) or quote{{nbsp}}({{!xt|"}}).
| |
| |-
| |
| | foot
| |
| | {{ xt|ft}}
| |
| |-
| |
| | foot per second
| |
| | {{ xt|ft/s}} ({{em|not}} {{!xt|fps}})
| |
| |
| |
| |-
| |
| | [[Hand (unit)|hand]]
| |
| | {{xt|h}} or {{ xt|hh}}
| |
| | Equal to 4 inches; used in measurement of horses. A dot may be followed by additional inches e.g. {{nobr|{{xt|16.2 hh}}}} indicates {{nobr|16 hands 2 inches.}}
| |
| |-
| |
| | knot
| |
| | {{xt|kn}} ({{em|not}} {{!xt| [[kilotonne|kt]]}} or {{!xt|[[kilonewton|kN]]}})<!--not sure how to resolve the conflicting coloration desiderata-->
| |
| |
| |
| |-
| |
| | {{plainlist|
| |
| * metre
| |
| * meter {{em|(U.S.)}}
| |
| }}
| |
| | {{xt|m}}
| |
| |
| |
| |-
| |
| | micron
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| | {{xt|μm}} ({{em|not}} {{!xt|μ}})
| |
| | Markup: <code>&mu;m</code>{{nbsp}} Link to [[micrometre]] (for which micron is a synonym) on first use.
| |
| |-
| |
| | [[astronomical unit]]
| |
| | {{xt|AU}} {{nobr| ({{em|not}} {{!xt|A.U.}}, {{!xt|au}}, {{!xt|ua}}) }}
| |
| | {{xtn|AU}} is the most commonly used unit symbol for the astronomical unit, both in popular and professional astronomical articles, and is hence also used on Wikipedia, although some organizations, including the [[Bureau International des Poids et Mesures|BIPM]]<ref name="SI Brochure" /> and [[International Astronomical Union|IAU]],<ref>{{cite web |title=Resolution B2 on the re-definition of the astronomical unit of length |url=http://www.iau.org/static/resolutions/IAU2012_English.pdf#page=3 |page=1 |year=2012 |website=International Astronomical Union}}</ref> recommend {{xtn|au}}.
| |
| |-
| |
| | mile
| |
| | {{xt|mi}}
| |
| |rowspan=3 | In nautical and aeronautical contexts use {{xt|statute mile}}<!-- ← Should this be an entry in the table? --> rather than mile to avoid confusion with nautical mile.
| |
| |-
| |
| | mile per hour
| |
| | {{xt|mph}}<!-- not ever mi/hr??-->
| |
| |-
| |
| | nautical mile
| |
| | {{nobr| {{xt|nmi}} or {{xt|NM}} {{nobr|({{em|not}} {{!xt|[[nanometre|nm]]}})}} }}
| |
| |-
| |
| | rowspan = 13 | '''Volume''',<br />'''Flow'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS -->
| |
| | rowspan = 2 | {{plainlist|
| |
| * cubic centimetre
| |
| * {{nobr| cubic centimeter {{em|(U.S.)}} }}
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| }}
| |
| | {{xt|cm<sup>3</sup>}}
| |
| | Markup: <code><nowiki>cm<sup>3</sup></nowiki></code>
| |
| |-
| |
| | {{xt|cc}}
| |
| | Non-SI symbol used for certain [[engine displacement]]s; link to [[Cubic centimetre]] on first use.<!-- I wonder if this can't be better coordinated with mpg, mph etc in earlier table. -->
| |
| |-
| |
| | imperial fluid ounce
| |
| | {{xt|imp fl oz}}
| |
| | rowspan=8 | {{xtn|US}} or {{xtn|imperial}} (or {{xtn|imp}}) must be specified; {{xtn|fluid}} or {{xtn|fl}} must be specified for fluid ounces and US units, except with gallon. (Without {{xtn|fluid}}, [[ounce]] is ambiguous{{snd}}versus avoirdupois ounce or troy ounce{{snd}}and US [[pint]] or US [[quart]] are ambiguous{{snd}}versus US dry pint or US dry quart.)
| |
| |-
| |
| | imperial pint
| |
| | {{xt|imp pt}}
| |
| |-
| |
| | imperial quart
| |
| | {{xt|imp qt}}
| |
| |-
| |
| | imperial gallon
| |
| | {{xt|imp gal}}
| |
| |-
| |
| | US fluid ounce
| |
| | {{xt|US fl oz}}
| |
| |-
| |
| | US fluid pint
| |
| | {{xt|US fl pt}}
| |
| |-
| |
| | US fluid quart
| |
| | {{xt|US fl qt}}
| |
| |-
| |
| | US gallon
| |
| | {{xt|US gal}}
| |
| |-
| |
| | cubic foot
| |
| | {{xt|cu ft}} ({{em|not}} {{!xt|cf}})
| |
| | Write {{xt|five million cubic feet}}, {{xt|5,000,000{{nbsp}}cu{{nbsp}}ft}} or {{xt|{{val|5|e=6|u=cuft}}}}, not {{!xt|5{{nbsp}}MCF}}.
| |
| |-
| |
| | {{nobr| cubic foot per second }}
| |
| | {{xt|cu ft/s}} ({{em|not}} {{!xt|cfs}})
| |
| |
| |
| |-
| |
| | {{plainlist|
| |
| * litre
| |
| * liter {{em|(U.S.)}}
| |
| }}
| |
| | {{xt|l}} or {{xt|L}}
| |
| | The symbol l ("el") in isolation (i.e. not in such forms as ml) is easily mistaken for the digit{{nbsp}}1 or the capital letter{{nbsp}}I{{nbsp}}("eye").
| |
| |-
| |
| | rowspan=7 | '''Mass''',<br />'''Force''',<br />'''Density''',<br />'''Pressure'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS -->
| |
| | [[long ton]]
| |
| | {{xt|long ton}}
| |
| | rowspan=2 | Spell out in full.
| |
| |-
| |
| | [[short ton]]
| |
| | {{xt|short ton}}
| |
| |-
| |
| | {{nobr| pound per square inch }}
| |
| | {{xt|psi}}
| |
| |
| |
| |-
| |
| | {{plainlist|
| |
| * [[tonne]]
| |
| * [[tonne|metric ton]] {{em|(U.S.)}}
| |
| }}
| |
| | {{xt|t}} {{nobr|({{em|not}} {{!xt|mt}} or {{!xt|MT}})}}
| |
| |
| |
| |-
| |
| | troy ounce
| |
| | {{xt|oz t}}
| |
| | rowspan=2 | {{xtn|t}} or {{xtn|troy}} must be specified. Articles about precious metals, black powder, and gemstones<!-- Is this list complete? --> should always specify whether ounces and pounds are [[Avoirdupois|avoirdupois]] or [[Troy weight|troy]].
| |
| |-
| |
| | troy pound
| |
| | {{xt|lb t}}
| |
| |-
| |
| | [[Carat (mass)|carat]]
| |
| | {{xt|carat}}
| |
| | Used to express masses of gemstones and pearls.
| |
| |-
| |
| | '''Purity'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS -->
| |
| | [[Carat (purity)|carat or karat]]
| |
| | {{xt|k}} or {{xt|Kt}}
| |
| | A measure of purity for gold alloys. (Do not confuse with the unit of mass with the same spelling.)
| |
| |-
| |
| | rowspan=5 | '''Time'''
| |
| | second
| |
| | {{xt|s}}
| |
| |rowspan=3|Do not use <code>&prime;</code>{{nbsp}}({{!xt|′}}), <code>&Prime;</code>{{nbsp}}({{!xt|″}}), apostrophe{{nbsp}}({{!xt|'}}) or quote{{nbsp}}({{!xt|"}}) for minutes or seconds. See also the hours–minutes–seconds formats for time durations described in the [[#Mixed units|Unit names and symbols table]].
| |
| |-
| |
| | minute
| |
| | {{xt|min}}
| |
| |-
| |
| | hour
| |
| | {{xt|h}}
| |
| |-
| |
| | rowspan=2|year
| |
| | {{xt|a}}
| |
| | Use {{xtn|a}} only with an [[SI annus|SI prefix multiplier]] ({{xt|a rock formation 540{{nbsp}}Ma{{nbsp}}old}}, not {{!xt|Life expectancy rose to 60 a}}).
| |
| |-
| |
| | {{xt|y}} or {{xt|yr}}
| |
| | {{crossref|See {{section link||Long periods of time}} for all affected units.}}
| |
| |-
| |
| | rowspan=4 |<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS -->
| |
| '''Infor­mation''', '''Data'''
| |
| | bit
| |
| | {{xt|bit}} {{nobr|({{em|not}} {{!xt|b}} or {{!xt|B}})}}
| |
| | rowspan=4 | {{crossref|See also {{section link||Quantities of bytes and bits}}, below.}} Do not confuse bit/second or byte/second with [[baud|baud (Bd)]].
| |
| |-
| |
| | byte
| |
| | {{nobr| {{xt|B}} or {{xt|byte}} ({{em|not}} {{!xt|b}} or {{!xt|[[octet (computing)|o]]}}) }}
| |
| |-
| |
| | bit per second
| |
| | {{xt|bit/s}} ({{em|not}} {{!xt|bps}}, {{!xt|b/s}})
| |
| |-
| |
| | byte per second
| |
| | {{xt|B/s}} or {{xt|byte/s}} {{nobr| ({{em|not}} {{!xt|Bps}} or {{!xt|Bps}}) }}
| |
| |-
| |
| | rowspan = 4 | '''Angle'''<!-- - - - WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS - - - -->
| |
| |-
| |
| | [[arcminute]]
| |
| | {{xt|′}}
| |
| | Markup: <code>&prime;</code>{{nbsp}} ([[prime (symbol)|prime ′]] not apostrophe/{{zwsp}}single quote{{nbsp}}{{!xt|'}}). {{nobr|No space ({{xt|47′}}, not {{!xt|47{{nbsp}}′}}). }}
| |
| |-
| |
| | [[arcsecond]]
| |
| | {{xt|″}}
| |
| | Markup: <code>&Prime;</code>{{nbsp}} ([[double prime (symbol)|double prime ″]] not double-quote{{nbsp}}{{!xt|"}}). {{nobr|No space ({{xt|22″}}, not {{!xt|22{{nbsp}}″}}). }}
| |
| |-
| |
| | degree
| |
| | {{xt|°}}
| |
| | Markup: <code>&deg;</code> (degree ° not [[masculine ordinal]] {{!xt|º}} or [[ring (diacritic)|ring]] {{thinsp}}{{!xt|̊}}{{hsp}}<!--<<hsp is needed to prevent crash between ring and closing paren, at least on some browsers-->). {{nobr|No space ({{xt|23°}}, not {{!xt|23{{nbsp}}°}}). }}
| |
| |-
| |
| | rowspan = 3 | '''Temp­erature'''<!-- - - - WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS - - - -->
| |
| | degree
| |
| | {{xt|°}}
| |
| | rowspan = 2 | Markup: <code>&deg;</code>. Use a nonbreaking space: {{nobr|<code>12{{t|nbsp}}&deg;C</code>}}, not {{nobr|<s><code>12&deg;C</code></s>}} nor {{nobr|<s><code>12&deg;{{t|nbsp}}C</code></s> }}
| |
| |-
| |
| | degree Celsius {{nobr|({{em|not}} degree centigrade)}}
| |
| | {{xt|°C}} ({{em|not}} {{!xt|C}})
| |
| |-
| |
| | [[kelvin]] {{nobr|({{em|not}} degree kelvin)}}
| |
| | {{xt|K}} ({{em|not}} {{!xt|°K}})
| |
| |
| |
| |-
| |
| | rowspan = 2 | '''Energy'''<!-- - - - WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF UNITS- - - -->
| |
| | {{plainlist|
| |
| * [[calorie]]
| |
| * small calorie
| |
| * gram calorie
| |
| }}
| |
| | {{xt|cal}}
| |
| | rowspan=2 | In certain subject areas, calorie is convention{{shy}}ally used alone. Articles following this practice should specify on first use whether the use refers to the small calorie or to the kilocalorie (large calorie). Providing conversions to [[International System of Units|SI]] units (usually calories to joules or kilocalories to kilojoules) may also be useful. A kilocalorie ({{xt|kcal}}) is 1000 calories. A calorie (small calorie) is the amount of energy required to heat 1 gram of water by 1 °C. A kilocalorie is therefore also a kilogram calorie.
| |
| |-
| |
| | {{plainlist|
| |
| * [[kilocalorie]]
| |
| * large calorie
| |
| * kilogram calorie
| |
| * ({{em|not}} Calorie{{snd}}{{nobr|can be ambiguous)}}
| |
| }}
| |
| | {{xt|kcal}}
| |
| |} | | |} |
|
| |
|
