View source for Inch

:''For other meanings, see [[Inch (disambiguation)]].''
{{unit of length|
|m= 0.0254
|accuracy=4 <!--Number of significant figures-->
}}

An '''inch''' (plural: '''inches'''; symbol or abbreviation: '''in''' or, sometimes, &nbsp;'''″'''&nbsp;— U+2033 - a [[Prime (symbol)|double prime]]) is the name of a [[Units of measurement|unit]] of [[length]] in a number of different systems, including [[English unit]]s, [[Imperial unit]]s, and [[United States customary units]]. Its size can vary from system to system. There are 36 inches in a [[yard]] and 12 inches in a [[Foot (unit of length)|foot]].  A corresponding unit of [[area]] is the [[square inch]] and a corresponding unit of [[volume]] is the [[cubic inch]].

The inch is one of the dominant units of measurement in the [[United States]], and is commonly used in [[Canada]]. In the US and commonly in the UK and Canada, [[Human height|personal heights]] are expressed in feet and inches by people of all ages, and by people over the age of about 40 in Australia. In Australia, Canada and New Zealand, personal heights are shown in metric units on official documents.<!--see talk-->
[[Image:Inch tape.jpg|right|250px|thumb|[[Tape measure|Measuring tape]] capable of measuring down to 1/32<sup>nd</sup> of an inch.]]

==International inch==
In [[1959]] the [[United States]] and countries of the [[Commonwealth of Nations]] defined the length of the international [[yard]] to be exactly 0.9144 [[meter]]s<ref>NIST: "[http://ts.nist.gov/WeightsAndMeasures/Publications/upload/AppendB_08_HB44_FINAL.pdf NIST Handbook 44, Appendix B, p. B-5]" </ref>.  Consequently, the international inch is defined to be exactly 25.4 [[millimeter]]s.

The international standard symbol for inch is '''in''' (see [[ISO 31-1]], Annex A). In some cases, the inch is denoted by a [[Prime (symbol)|double prime]], which is often approximated by [[quotation mark|double quotes]], and the [[Foot (unit of length)|foot]] by a [[Prime (symbol)|prime]], which is often approximated by an [[apostrophe (mark)|apostrophe]].  For example, 6 feet 4 inches is denoted as 6&prime;4&Prime; (or approximated as 6'4").

==See also==
*[[English unit]]
*[[Imperial unit]]
*[[United States customary units]]
*[[Gry (disambiguation)|Gry]]
*[[Pyramid inch]]
*[[Guz]]
*[[Inch (Scots)]]
*[[Line (length)]]

== Notes ==
{{reflist|2}}

== External links ==

* [http://som.showdown.hu Screen-o-meter]

[[Category:Units of length]]
[[Category:Imperial units]]
[[Category:Customary units in the United States]]
[[Category:Human-based units of measure]]

[[ar:إنش]]
[[ast:Pulgada]]
[[bg:Инч]]
[[ca:Polzada]]
[[cv:Дюйм]]
[[cs:Palec (jednotka délky)]]
[[da:Tomme]]
[[de:Zoll (Einheit)]]
[[et:Toll (pikkusühik)]]
[[el:Ίντσα]]
[[es:Pulgada]]
[[eo:Colo]]
[[fa:اینچ]]
[[fr:Pouce (unité)]]
[[ko:인치]]
[[hr:Palac (jedinica)]]
[[id:Inci]]
[[it:Pollice (unità di misura)]]
[[he:אינץ']]
[[sw:Inchi]]
[[ku:Înç]]
[[la:Uncia]]
[[hu:Hüvelyk (mértékegység)]]
[[mk:Инч]]
[[ms:Inci]]
[[nl:Inch]]
[[ja:インチ]]
[[no:Tomme (mål)]]
[[nn:Tomme]]
[[uz:Dyuym]]
[[pl:Cal]]
[[pt:Polegada]]
[[ro:Ţol (unitate)]]
[[ru:Дюйм]]
[[sq:Inçi]]
[[simple:Inch]]
[[sk:Palec (jednotka dĺžky)]]
[[sl:Palec]]
[[sr:Инч]]
[[fi:Tuuma]]
[[sv:Tum]]
[[ta:அங்குலம்]]
[[vi:Inch]]
[[tr:İnç]]
[[uk:Дюйм]]
[[zh:英寸]]
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