Velocity [linear]

unit name	symbol	SI equiv.
centimeter per second	cm/s	1e-02 m/s
meter per second	m/s	1 m/s
kilometer per second	km/s	1e+03 m/s
kilometer per hour	km/hr	2.77778e-01 m/s
foot per second	ft/s	3.048e-01 m/s
foot per hour	ft/hr	8.46667e-05 m/s
inch per second	inch/s	2.54e-02 m/s
knot	knot	5.14444e-01 m/s
mile per hour	mph	4.4704e-01 m/s
speed of light in vacuum	(speed of light in vacuum) m/s	2.99792e+08 m/s	i speed of light in vacuum The speed of light in vacuum is exactly 299 792 458 m/s
Mach	M	3.316e+02 m/s	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.