Kilometres per hour
The kilometre per hour (American English: kilometer per hour) is a unit of speed or velocity, expressing the number of kilometers traveled in one hour. The unit symbol is km/h or km·h−1; however, the colloquial abbreviations "kph" and "kmph" are sometimes also used in English-speaking countries, in analogy to mph, although these are not in accordance with international scientific standards. In North American slang and military usage, km/h (as well as km) is commonly pronounced, and sometimes even written, as klicks or kays (K's), although these may also be used to refer to kilometres.
Worldwide, the km/h is the most commonly used speed unit on road signs and car speedometers. Therefore, it is far more common in everyday usage than the proper SI unit of speed, m/s. Along with the kW·h, km/h is the most commonly used metric unit based on the hour, which is only a "non-SI unit accepted for use with the International System of Units" by the BIPM.
Conversions
3.6 km/h ≡ 1 m/s, the SI unit of speed, metre per second
1 km/h ≈ 0.277 78 m/s
1 km/h ≈ 0.621 37 mph ≈ 0.911 34 feet per second
1 knot ≡ 1.852 km/h (exactly)
1 mile per hour ≡ 1.609344 km/h (~1.61 km/h)
Translation
The phrase "Kilometres per hour" occurs as such in the following languages: English, Simple English.
Translation(s) in other languages: Arabic: كيلومتر في الساعة, Asturian: Quilómetru por hora, Bosnian: Kilometar na sat, Bulgarian: Километър в час, Catalan: Quilòmetre per hora, Czech: Kilometr za hodinu, German: Kilometer pro Stunde, Spanish: Kilómetro por hora, Esperanto: Kilometro en horo, Basque: Kilometro orduko, French: Kilomètre par heure, Korean: 킬로미터 매 시간, Croatian: Kilometar na sat, Indonesian: Kilometer per jam, Italian: Chilometro orario, Hebrew: קילומטר לשעה, Swahili: Km/h, Latvian: Kilometri stundā, Macedonian: Километри на час, Malay: Kilometer sejam, Dutch: Kilometer per uur, Japanese: キロメートル毎時, Norwegian (Bokmål): Km/t, Norwegian (Nynorsk): Kilometer per time, Polish: Kilometr na godzinę, Portuguese: Quilômetro por hora, Romanian: Kilometru pe oră, Russian: Километр в час, Slovak: Kilometer za hodinu, Slovenian: Kilometer na uro, Finnish: Kilometri tunnissa, Swedish: Kilometer per timme, Thai: กิโลเมตรต่อชั่วโมง, Chinese: 千米每小时.
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