relative Mach number


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Related to relative Mach number: Critical Mach number

relative Mach number

[′rel·əd·iv ′mäk ‚nəm·bər]
(fluid mechanics)

Mach number

The ratio of the velocity of a body to that of sound in a surrounding medium. A Mach number of 0.8 or 1.2 means that the aircraft is flying at 0.8 or 1.2 times, respectively, the local speed of sound at that ambient temperature. Also known as a relative Mach number.
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