Kilometer/hour (kph)
Definition: Kilometer per hour (symbol: km/h or kph) is a unit of speed expressing the number of kilometers traveled in one hour. It is commonly used in everyday life to measure vehicle speed and is the standard unit of speed in most countries that use the metric system.
History/origin: The kilometer per hour is derived from the kilometer, which was introduced as part of the metric system in 1795. It has since become the standard unit of speed for road traffic in most parts of the world.
Current use: The kilometer per hour is widely used globally for measuring vehicle speeds, speed limits, and in various sports like running and cycling.
Meter/second (mps)
Definition: Meter per second (symbol: m/s or mps) is the SI derived unit of speed. It is defined as the distance in meters traveled in one second. It is the standard unit of speed in physics and engineering.
History/origin: The meter per second is based on the meter, the base unit of length in the SI, and the second, the base unit of time. It has been used since the advent of the metric system.
Current use: The meter per second is commonly used in physics, engineering, and meteorology. It is also used in sports like track and field to measure wind speed and sprint speeds.