Miles per Hour (mph)

• Definition: A unit of speed expressing the number of international miles traveled in one hour.
• History: Emerged alongside the standardization of the mile and hour, gaining widespread prominence with the advent of rail travel and early automobiles.
• Common Uses: Speed limit signs and vehicle speedometers in the United States and the United Kingdom.

Kilometers per Hour (km/h or kph)

• Definition: A metric unit of speed expressing the number of kilometers traveled in one hour.
• History: Adopted across countries as they moved to the metric system for transport, facilitating uniform speed tracking across international borders.
• Common Uses: The standard measurement for vehicle speeds, speed limits, and wind speeds worldwide outside of the US and UK.