Kilometres per hour

Kilometres per hour
Metric speedometer from a 1992 Euro-spec Passat B3.jpg
A car speedometer that indicates measured speed in kilometres per hour.
Unit information
Unit systemderived
Unit ofspeed
Symbolkm/h or kph 
Unit conversions
1 km/h in ...... is equal to ...
   mph   0.621371
   m/s   0.277778
   knot   0.539957
   ft/s   0.911344

The kilometre per hour (American English: kilometer per hour) is a unit of speed, expressing the number of kilometres travelled in one hour.

Worldwide, km/h is the most commonly used unit of speed on road signs and car speedometers.[1][2]

History

Although the metre was formally defined in 1799, the term "kilometres per hour" did not come into immediate use – the myriametre (10,000 metres) and myriametre per hour were preferred to kilometres and kilometres per hour. In 1802 the term "myriamètres par heure" appeared in French literature[3] and many French maps printed in the first half of the nineteenth century had scales in leagues and myriametres, but not in kilometres.[4] The Dutch on the other hand adopted the kilometre in 1817 but gave it the local name of the mijl.[5]

Other Languages
български: Километър в час
Bahasa Indonesia: Kilometer per jam
Kiswahili: Km/h
македонски: Километри на час
Bahasa Melayu: Kilometer sejam
Nederlands: Kilometer per uur
norsk: Km/t
norsk nynorsk: Kilometer per time
Simple English: Kilometres per hour
slovenčina: Kilometer za hodinu
slovenščina: Kilometer na uro
српски / srpski: Километар на час
srpskohrvatski / српскохрватски: Kilometar na sat
Tiếng Việt: Kilômét trên giờ