What is speed?Speed is a measure of how fast something is moving. The average speed of an object in a certain time is the distance the object travelled divided by the time. Speed is often confused with velocity. Velocity is speed with a direction. In other words, velocity is the vector quantity and speed is the scalar quantity.
InputMach is the ratio of a speed of an object compared to the speed of sound. For the calculation of this converter, the speed of sound in dry air at mean sea level at standard temperature of 15°C is used, which is 340.3 meters per second.
Miles Per Hour (also abbreviated: mph) is the speed of an object covering a distance of one mile in a time of one hour.