+The **Mach Number** is a dimensionless quantity representing the ratio of an object's speed through a fluid to the [Speed of Sound](/wiki/speed_of_sound) in that fluid. It is crucial in [Aerodynamics](/wiki/aerodynamics) for classifying flow regimes as subsonic, sonic, or supersonic.
+## See also
+- [Fluid Dynamics](/wiki/fluid_dynamics)
+- [Supersonic Flight](/wiki/supersonic_flight)
+- [Shock Wave](/wiki/shock_wave)
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