This is another important part of aerodynamics. This is a phenomenon that occurs when a solid body like an airplane travels faster then the speed of sound. The speed sound varies with temperature, humidity and pressure.

It plays a very important role in aerodynamic equations and is represented by a Mach-number. The Mach number represents the speed of object relative to its surrounding atmosphere. A mach number of 1 roughly represents a speed of 1 220 km/h.

# A concorde

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