According to the [[International Bureau of Weights and Measures]], when spelled or spoken, the unit is pluralised using the same grammatical rules as for other [[International System of Units#Writing the unit names|SI units]] such as the [[volt]] or [[ohm]] (e.g. "... the triple point of water is exactly 273.16 kelvins"<ref name=sib211>{{cite web |title=Rules and style conventions for expressing values of quantities |work=SI Brochure, 8th edition |pages=Section 2.1.1.5 |url=http://www.bipm.org/en/si/si_brochure/chapter2/2-1/kelvin.html |publisher=Bureau International des Poids et Mesures |year=1967 |access-date=2012-08-27 |url-status=live |archive-url=https://web.archive.org/web/20120716203545/http://www.bipm.org/en/si/si_brochure/chapter2/2-1/kelvin.html |archive-date=16 July 2012}}</ref>). When reference is made to the "Kelvin ''scale''", the word "kelvin"—which is normally a noun—functions [[noun adjunct|adjectivally]] to modify the noun "scale" and is capitalized. As with most other SI unit symbols (angle symbols, e.g. 45° 3′ 4″, are the exception) there is a space between the numeric value and the kelvin symbol (e.g. "99.987 K").<ref name=nist>{{cite web |title=SI Unit rules and style conventions |url=http://physics.nist.gov/cuu/Units/checklist.html |publisher=National Institute of Standards and Technology |date=September 2004 |access-date=2008-02-06 |url-status=live |archive-url=https://web.archive.org/web/20080205121848/http://physics.nist.gov/cuu/Units/checklist.html |archive-date=5 February 2008}}</ref><ref name=sib533>{{cite web |title=Rules and style conventions for expressing values of quantities |work=SI Brochure, 8th edition |pages=Section 5.3.3 |url=http://www.bipm.org/en/publications/si-brochure/section5-3.html |publisher=Bureau International des Poids et Mesures |year=1967 |access-date=2015-12-13 |url-status=live |archive-url=https://web.archive.org/web/20150923203341/http://www.bipm.org/en/publications/si-brochure/section5-3.html |archive-date=23 September 2015}}</ref> (The style guide for [[CERN]], however, specifically says to always use "kelvin", even when plural.)<ref>{{Cite web|url=https://writing-guidelines.web.cern.ch/entries/kelvin|title=kelvin {{!}} CERN writing guidelines|website=writing-guidelines.web.cern.ch|access-date=2019-09-19|archive-url=https://web.archive.org/web/20200417105506/https://writing-guidelines.web.cern.ch/entries/kelvin|archive-date=17 April 2020}}</ref>▼
▲According to theПрема [[International Bureau of Weights and Measures|Међународном бироу за тегове и мере]], whenкада spelledсе orспелује spokenили изговара, theза unitјединицу isсе pluralisedу usingмножини theкористе sameиста grammaticalграматичка rulesправила asкао forи otherза друге [[International System of Units#Writing the unit names|SIСИ unitsјединице]] suchкао asшто theсу [[voltволт]] orили [[ohmОм (јединица)|ом]] (e.gнпр. "„...трострука theтачка tripleводе pointје of water is exactlyтачно 273.,16 kelvins"келвина”<ref name=sib211>{{cite web |title=Rules and style conventions for expressing values of quantities |work=SI Brochure, 8th edition |pages=Section 2.1.1.5 |url=http://www.bipm.org/en/si/si_brochure/chapter2/2-1/kelvin.html |publisher=Bureau International des Poids et Mesures |year=1967 |access-date=2012-08-27 |url-status=live |archive-url=https://web.archive.org/web/20120716203545/http://www.bipm.org/en/si/si_brochure/chapter2/2-1/kelvin.html |archive-date=16 July 2012}}</ref>). WhenКада referenceсе isупућује madeна to the "Kelvin„Келвинову ''scaleскалу''"“, theреч word„келвин“ "kelvin"—which— isкоја normallyје aобично noun—functionsименица [[noun— adjunct|adjectivally]]функционише toкао modifyпридев theда nounмодификује "scale"именицу and„скала“ и пише isсе capitalizedвеликим словима. AsКао withи mostкод otherвећине SIдругих unitсимбола symbolsСИ јединица (angleизузетак су симболи symbolsуглова, e.gнпр. 45° 3′ 4″, are the exception) thereпостоји isразмак aизмеђу spaceнумеричке betweenвредности theи numericсимбола value and the kelvin symbolкелвин (e.gнпр. "99.„99,987 K" К“).<ref name=nist>{{cite web |title=SI Unit rules and style conventions |url=http://physics.nist.gov/cuu/Units/checklist.html |publisher=National Institute of Standards and Technology |date=September 2004 |access-date=2008-02-06 |url-status=live |archive-url=https://web.archive.org/web/20080205121848/http://physics.nist.gov/cuu/Units/checklist.html |archive-date=5 February 2008}}</ref><ref name=sib533>{{cite web |title=Rules and style conventions for expressing values of quantities |work=SI Brochure, 8th edition |pages=Section 5.3.3 |url=http://www.bipm.org/en/publications/si-brochure/section5-3.html |publisher=Bureau International des Poids et Mesures |year=1967 |access-date=2015-12-13 |url-status=live |archive-url=https://web.archive.org/web/20150923203341/http://www.bipm.org/en/publications/si-brochure/section5-3.html |archive-date=23 September 2015}}</ref> (TheВодич styleза guideстилове forза -{[[CERN]]}-, howeverмеђутим, specificallyпосебно saysнаводи toда alwaysсе useувек "kelvin"користи „келвин“, evenчак и када је реч whenу pluralмножини.)<ref>{{Cite web|url=https://writing-guidelines.web.cern.ch/entries/kelvin|title=kelvin {{!}} CERN writing guidelines|website=writing-guidelines.web.cern.ch|access-date=2019-09-19|archive-url=https://web.archive.org/web/20200417105506/https://writing-guidelines.web.cern.ch/entries/kelvin|archive-date=17 April 2020}}</ref>
Before the 13th CGPM in 1967–1968, the unit kelvin was termed a "degree", the same as with the other temperature scales at the time. It was distinguished from the other scales with either the adjective suffix "Kelvin" ("degree Kelvin") or with "absolute" ("degree absolute") and its symbol was °K. The latter term (degree absolute), which was the unit's official name from 1948 until 1954, was ambiguous since it could also be interpreted as referring to the [[Rankine scale]]. Before the 13th CGPM, the plural form was "degrees absolute". The 13th CGPM changed the unit name to simply "kelvin" (symbol: K).<ref>{{cite journal |author=Barry N. Taylor |title=Guide for the Use of the International System of Units (SI) |version=Special Publication 811 |format=.PDF |publisher=National Institute of Standards and Technology |url=http://physics.nist.gov/cuu/pdf/sp811.pdf |year=2008 |access-date=2011-03-05 |url-status=live |archive-url=https://web.archive.org/web/20160603203340/http://physics.nist.gov/cuu/pdf/sp811.pdf |archive-date=3 June 2016}}</ref> The omission of "degree" indicates that it is not relative to an arbitrary reference point like the Celsius and Fahrenheit scales (although the Rankine scale continued to use "degree Rankine"), but rather an absolute unit of measure which can be manipulated algebraically (e.g. multiplied by two to indicate twice the amount of "mean energy" available among elementary degrees of freedom of the system).
Пре 13. -{CGPM}- 1967–1968, јединица келвин се називала „степен“, исто као и на другим температурним скалама у то време. Од осталих скала разликовала се било суфиксом придева „Келвин“ („степен Келвина“) или „апсолутним“ („апсолутни степен“) и њен симбол је био °К. Последњи израз (апсолутни степен), који је био службени назив јединице од 1948. до 1954. године, био је двосмислен јер би се такође могао тумачити као да се односи на [[Ранкинова скала|Ренкинову скалу]]. Пре 13. -{CGPM}-, облик множине је био „апсолутни степени“. Тринаести -{CGPM}- је променио назив јединице у једноставно „келвин” (симбол: -{K}-).<ref>{{cite journal |author=Barry N. Taylor |title=Guide for the Use of the International System of Units (SI) |version=Special Publication 811 |format=.PDF |publisher=National Institute of Standards and Technology |url=http://physics.nist.gov/cuu/pdf/sp811.pdf |year=2008 |access-date=2011-03-05 |url-status=live |archive-url=https://web.archive.org/web/20160603203340/http://physics.nist.gov/cuu/pdf/sp811.pdf |archive-date=3 June 2016}}</ref> Изостављање „степена“ указује на то да он није релативан у односу на произвољну референтну тачку као што је Целзијусова и Фаренхајтова скала (иако је Ранкинова скала наставила да користи „степен Ранкина“), већ је апсолутна јединица мере којом се може манипулисати алгебарски (нпр. помножено са два да би се указало на дупло већу количину „средње енергије” доступне међу елементарним степенима слободе система).
