Kilometres per hour: Difference between revisions
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'''Kilometres per hour''' ([[American English]]: '''kilometers per hour''') is a [[physical unit|unit]] of both [[speed]] ([[scalar (physics)|scalar]]) and [[velocity]] ([[vector (spatial)|vector]]). The unit symbol is '''km/h''' or '''km·h<sup>−1</sup>'''; however, the incorrect abbreviations "kph" and "kmph" are sometimes also used in English-speaking countries, in analogy to [[mph]]. 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). |
'''Kilometres per hour''' ([[American English]]: '''kilometers per hour''') is a [[physical unit|unit]] of both [[speed]] ([[scalar (physics)|scalar]]) and [[velocity]] ([[vector (spatial)|vector]]). The unit symbol is '''km/h''' or '''km·h<sup>−1</sup>'''; however, the incorrect abbreviations "kph" and "kmph" are sometimes also used in English-speaking countries, in analogy to [[mph]]. 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 strictly these refer to kilometres rather than kilometres per hour. |
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| ⚫ | 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 [[International System of Units|SI]] unit of speed, [[metre per second|m/s]]. Along with the [[kWh|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 [[International Bureau of Weights and Measures|BIPM]].<ref>[http://www.bipm.org/en/si/si_brochure/ BIPM brochure] (SI reference)</ref> |
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By definition, an object travelling at a speed of 1 km/h for 1 hour moves 1 [[kilometre]]. |
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| ⚫ | 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 [[International System of Units|SI]] unit of speed, [[metre per second|m/s]]. Along with the [[kWh]], 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 [[International Bureau of Weights and Measures|BIPM]].<ref>[http://www.bipm.org/en/si/si_brochure/ BIPM brochure] (SI reference)</ref> |
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==Conversions== |
==Conversions== |
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Revision as of 09:12, 16 November 2007
Kilometres per hour (American English: kilometers per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h−1; however, the incorrect abbreviations "kph" and "kmph" are sometimes also used in English-speaking countries, in analogy to mph. 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 strictly these refer to kilometres rather than kilometres per hour.
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.[1]
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)[2]
- 1 mile per hour = ~1.61 kilometres per hour
- 1 kilometre per hour = ~0.62 miles per hour
See also
References
- ^ BIPM brochure (SI reference)
- ^ 1 yard ≡ 0.9144 m and
1 mile = 1760 yards thus
1 mile = 1760 × 0.9144 ÷ 1000 km
External links
- The converter Online conversions for speed units: km/h, mph, knots, etc.
- Conversion Calculator for Units of Speed
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