Kilometres per hour

Kilometres per hour (km/h) is a unit of speed equal to one kilometre of travel per hour. It expresses distance travelled per unit of time.

Speed: Speed is the rate at which an object covers distance. Kilometres per hour is one way to express this rate.
Unit conversion: Unit conversion is the process of expressing a measurement in different units without changing its value. It converts km/h to units such as metres per second or miles per hour.
Speed limit: A speed limit is the maximum or minimum legal speed permitted on a route or in an area. Many countries state road speed limits in kilometres per hour.
Miles per hour: Miles per hour is a speed unit equal to one mile travelled in one hour. It is the common road-speed alternative to km/h in several countries.
Distance: Distance is the length of the path between two points. The kilometre in km/h measures how far an object travels.
Dimensional analysis: Dimensional analysis checks equations by tracking the physical dimensions of their quantities. Distance divided by time confirms that km/h has dimensions of speed.
Road traffic safety: Road traffic safety concerns reducing deaths and injuries involving road users. Posted km/h limits help drivers judge legally permitted speeds.
Knot: A knot is a speed unit equal to one nautical mile per hour. Marine and aviation speeds commonly use knots instead of km/h.
Time: Time is the continuous quantity in which events occur in sequence and durations are measured. The hour in km/h sets the duration for the measured distance.
Speedometer: A speedometer is an instrument that indicates the speed of a vehicle. Vehicle speedometers commonly display speed in kilometres per hour.

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