Velocity [linear]

precision

value	unit
	cm/s	i centimeter per second
	m/s	i meter per second
	km/s	i kilometer per second
	km/hr	i kilometer per hour
	ft/s	i foot per second
	ft/hr	i foot per hour
	inch/s	i inch per second
	knot	i knot
	mph	i mile per hour
	(speed of light in vacuum) m/s	i speed of light in vacuum The speed of light in vacuum is exactly 299 792 458 m/s
	M	i Mach Measure of relative velocity, used to express the speed of an aircraft relative to the speed of sound. The actual speed of sound varies, depending on the density and temperature of the atmosphere. At 0 ?C and a pressure of 1 atmosphere the speed of sound is about 331.6 m/s.