Mach number

noun
\ ˈmäk- How to pronounce Mach number (audio) \

Definition of Mach number

: a number representing the ratio of the speed of a body (such as an aircraft) to the speed of sound in a surrounding medium (such as air)

First Known Use of Mach number

1937, in the meaning defined above

History and Etymology for Mach number

Ernst Mach †1916 Austrian physicist

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Time Traveler for Mach number

Time Traveler

The first known use of Mach number was in 1937

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Cite this Entry

“Mach number.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/Mach%20number. Accessed 22 November 2019.

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More Definitions for Mach number

Mach number

noun
\ ˈmäk- How to pronounce Mach number (audio) \

Medical Definition of Mach number

: a number representing the ratio of the speed of a body to the speed of sound in a surrounding medium (as air) a Mach number of 2 indicates a speed that is twice that of sound

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