KMH

Kilometers per hour (km/h) is a unit of speed expressing the number of kilometers traveled in one hour. It is derived from the kilometer, a metric unit of length, and the hour, a unit of time.

One kilometer per hour equals 1000 meters per 3600 seconds, which is 5/18 meters per second, or about 0.27778 m/s. Conversely, 1 m/s equals 3.6 km/h. For example, a speed of 100 km/h corresponds to about 62.14 mph, illustrating the relationship between metric and imperial speed units.

Usage and context: km/h is the standard speed unit on road signs, vehicle dashboards, and weather reports in most countries that use the metric system. It is convenient for everyday communication and practical driving guidance. In scientific contexts, meters per second (m/s) is the preferred unit for speed, while km/h remains common for public-facing information. The United States predominantly uses miles per hour (mph) for road speeds, whereas many other countries rely on km/h.

Adoption and classification: Kilometers per hour is a non-SI unit accepted for use with the International System of Units. The SI base unit of speed is the meter per second, but km/h remains widely used due to its compatibility with the metric system and everyday familiarity.