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Mach number

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Mach number

Ratio of the speed of a body to the speed of sound in the medium through which the body travels. In the Earth's atmosphere, Mach 1 is reached when a body (such as an aircraft or spacecraft) ‘passes the sound barrier’, at a velocity of 331 m/1,087 ft per second (1,192 kph/740 mph) at sea level. A space shuttle reaches Mach 15 (about 17,700 kph/11,000 mph an hour) 6.5 minutes after launch.

The Mach number is named after Austrian physicist Ernst Mach.
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The boundary conditions of the measurement points are specified by the operating conditions of the test rigs and are presented in Figure 6, which shows the Mach number versus the Reynolds number for the cone-valve geometry.
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