# Kilometres per hour

Kilometres per hour

:(For the South African airport with IATA code "KMH", see Johan Pienaar Airport.)

The kilometre per hour (American English: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). 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.

The km/h is the worldwide 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. [ [http://www.bipm.org/en/si/si_brochure/ BIPM brochure] (SI reference)]

Conversions

* 3.6 km/h ≡ 1 m/s, the SI derived 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 = 1.609344 km (~1.61 km) [1 yard ≡ 0.9144 m and
1 mile = 1760 yards thus
1 mile = 1760 × 0.9144 ÷ 1000 km
]
* 1 mile per hour = ~1.61 kilometres per hour
* 1 kilometre per hour = ~0.62 miles per hour

ee also

*Orders of magnitude (speed)

References

* [http://flauna.org/speed/ The converter] Online conversions for speed units: km/h, mph, knots, etc.
* [http://www.odometre.com Online Conversions of Metric and Imperial Units]
* [http://www.convert-me.com/en/convert/speed Conversion Calculator for Units of Speed]

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### Look at other dictionaries:

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