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What are airplane mach numbers?

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Mach refers to the speed of sound. A plane that travels at Mach 2 means that it travels twice the speed of sound in air. The actual speed will vary a bit depending on the altitude.

Mach number is a measure of relative speed. It is the speed of something relative to a medium, usually air, and divided by the speed of sound in that medium:

is the Mach number

is the velocity of the object relative to the medium used and

is the velocity of sound in the medium

Mach number is the number of times the speed of sound an object or a duct, or the fluid medium itself, move relative to each other. It is named afteran Austrian physicist Ernst Mach.


Contributor: Aggie80
First answer by Aggie80. Last edit by Aggie80. Contributor trust: 4980 [recommend contributor recommended]. Question popularity: 21 [recommend question].

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