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→Notation history: km/h is on page 127 - not 147 - of the original and 2022 editions of SI Brochure 9. Slight ce to make sentence grammatical again. |
Moved sources for abbreviations to the "Notation history" section. Issue is not about being SI's spokespeople, but about undue weight in the lead. There was no consensus to add them there to begin with. |
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}}{{Dispute about|the implied role of the BIPM wrt to the regulation of the English language|talkpage=Kilometres per hour#Proposal for description of the non-SI abbreviations as "non-standard" or "non-scientific"|date=November 2022}}
The '''kilometre per hour''' ([[SI]] symbol: '''km/h'''
==History==
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==Notation history==
The SI representations, classified as symbols, are "km/h", "{{nowrap|km h<sup>−1</sup>}}" and "{{nowrap|km·h<sup>−1</sup>}}". Several other abbreviations of "kilometres per hour" have been used since the term was introduced and many are still in use today; for example, dictionaries list "kph",<ref>{{cite OED|k.p.h.|access-date=18 May 2022}}</ref><ref>[https://www.merriam-webster.com/dictionary/kph "kph."] [[Merriam-Webster|''Merriam-Webster.com'']]. Retrieved 10 September 2023.</ref><ref name=collins>[https://www.collinsdictionary.com/dictionary/english/kph "kph."] ''[[Collins English Dictionary]]''. Retrieved 10 September 2023.</ref> "kmph" and "km/hr"<ref>[https://www.google.es/books/edition/Journal_of_Research/hCs6AAAAIAAJ?hl=en&gbpv=1&dq=km/hr&pg=PA126&printsec=frontcover ''Journal of Research of the National Bureau of Standards: Radio propagation. D'', Volume 65, pp. 122–126. 1961.] [[National Bureau of Standards]]. ''Google Books''. Retrieved 10 September 2023.</ref> as English abbreviations. While these forms remain widely used, the International Bureau of Weights and Measures uses "km/h" in describing the definition and use of the International System of Units.<ref>{{SIbrochure9th|page=127}}</ref> The entries for "kph" and "kmph" in the ''[[Oxford Advanced Learner's Dictionary]]'' state that "the correct scientific unit is km/h and this is the generally preferred form".<ref>{{Cite web |title=kph abbreviation |url=https://www.oxfordlearnersdictionaries.com/definition/english/kph |url-status=live |website=Oxford Advanced Learner's Dictionary}}</ref>
===Abbreviations===
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