Kilometer per hour

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The kilometer per hour is a unit of measurement of speed, both scalar and vectorial. An object travels at an average speed of 1 km/h if it moves 1 kilometer in one hour.

The symbol used for this unit is km/h, although the notation kph is also used in some English-speaking countries.

This unit of measurement does not belong to the International System of Units (SI). The SI derived unit for velocity is the meter per second (m/s). However, it is the most widely used unit worldwide to indicate speeds in land transport, be it road transport or rail transport. kWh and km/h are the most widely used units that are based on the hour. Time is the only non-SI unit that is accepted for use with SI units by the International Bureau of Weights and Measures.

Equivalences with other units

3.6 km/h = 1 m/s
60 km/h = 1 km/min
3600 km/h = 1 km/s
1 km/h = 0.27778 m/s
1 km/h = 0.62137 mph = 0.91134 ft/s
1 knot = 1,852 km/h
1 mile per hour = 1,609344 km/h

Examples

30 km/h in urban area

3-5 km/h	Speed of walking an average human.
8 km/h	Speed of the trot of an average human.
15 km/h	Speed running from an average human.
20 km/h	Commercial speed of fret train in France
28 km/h	Speed of a bicycle.
30 km/h	Motorcycle speed. Zone 30 in residential areas in Europe.
40 km/h	Speed that reaches an elite athlete in the 100 meters smooth.
50 km/h	Limit speed in the city avenues and roads in several European countries
60 km/h	Transit limit speed in residential areas.
70 km/h	Speed of hazardous areas in several European countries
80-90 km/h	Limit speed on some avenues and roads.
100 km/h	Limit speed of interurban buses on some routes, mainly highways.
110-120 km/h	Limit speed on some routes, mainly highways.
200-250 km/h	Limit between conventional speed trains and high-speed trains according to the International Union of Railways and the Directive (EU) 96/48/EC, Annex 1.
293 km/h	Speed (speed log) Train pendolino
300-380 km/h	Commercial speeds reaching high-speed trains and Maglev: 300, 320 and 350
387 km/h	Speed (speed cord) Hyperloop one
575 km/h	High-speed rail (speed rail) in France
430-603 km/h	Speed (speed string) reach maglevs (501 in China, 603 in Japan)
800-1000 km/h	Speed of passengers.
1235 km/h	Sound speed in air at 20 °C, with 50% humidity and sea level.
2000 km/h	Speed of some combat planes.
23 039 km/h	Sound speed in aluminum.
30 000 km/h	Average speed of a spacecraft traveling in space.
40 320 km/h	Earth's escape speed.
70 000 km/h	Speed that could reach an asteroid that impacted the Earth.
107 208 km/h	Earth's speed in transit around the Sun.
255 600 km/h	Maximum detected speed of the comets.
468,000 km/h	Translating speed of the Milky Way.
792 000 km/h	Translating speed of the Sun in the Milky Way.
1 080 000 000 km/h	Light speed.

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