( Akış içindeki serbest akım hızının, ses hızına oranı. )

( 1 kilometer/hour [km/h] = 0.2777777778 meter/second [m/s]

1 mile/hour [mi/h] = 0.44704 meter/second [m/s]

1 meter/hour [m/h] = 0.0002777778 meter/second [m/s]

1 meter/minute [m/min] = 0.0166666667 meter/second [m/s]

1 kilometer/minute [km/min] = 16.6666666667 meter/second [m/s]

1 kilometer/second [km/s] = 1000 meter/second [m/s]

1 centimeter/hour [cm/h] = 2.7777777777778E-6 meter/second [m/s]

1 centimeter/minute [cm/min] = 0.0001666667 meter/second [m/s]

1 centimeter/second [cm/s] = 0.01 meter/second [m/s]

1 millimeter/hour [mm/h] = 2.7777777777778E-7 meter/second [m/s]

1 millimeter/minute [mm/min] = 1.66667E-5 meter/second [m/s]

1 millimeter/second [mm/s] = 0.001 meter/second [m/s]

1 foot/hour [ft/h] = 8.46667E-5 meter/second [m/s]

1 foot/minute [ft/min] = 0.00508 meter/second [m/s]

1 foot/second [ft/s] = 0.3048 meter/second [m/s]

1 yard/hour [yd/h] = 0.000254 meter/second [m/s]

1 yard/minute [yd/min] = 0.01524 meter/second [m/s]

1 yard/second [yd/s] = 0.9144 meter/second [m/s]

1 mile/minute [mi/min] = 26.8224 meter/second [m/s]

1 mile/second [mi/s] = 1609.344 meter/second [m/s]

1 knot [kt, kn] = 0.5144444444 meter/second [m/s]

1 knot (UK) [kt (UK)] = 0.5147733333 meter/second [m/s]

1 Velocity of light in vacuum = 299792458 meter/second [m/s]

1 Cosmic velocity - first = 7899.9999999999 meter/second [m/s]

1 Cosmic velocity - second = 11200 meter/second [m/s]

1 Cosmic velocity - third = 16670 meter/second [m/s]

1 Earth's velocity = 29765 meter/second [m/s]

1 Velocity of sound in pure water = 1482.6999999998 meter/second [m/s]

1 Velocity of sound in sea water (20°C, 10 meter deep) = 1521.6 meter/second [m/s]

1 Mach (20°C, 1 atm) = 343.6 meter/second [m/s]

1 Mach (SI standard) = 295.0464000003 meter/second [m/s] )