Mile per hour, Speed

Miles per hour is a unit of speed, expressing the number of international miles covered per hour. Miles per hour is the unit used for speed limits on roads in the United Kingdom, United States and various other nations, where it is commonly abbreviated in everyday use to mph or MPH, although mi/h is sometimes used in technical publications. Read more >>

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Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t. Speed is a scalar quantity with dimensions distance/time; the equivalent vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity. Read more >>