An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Mach number
  عدد ِ ماخ  
adad-e Mach (#)
Fr.: nombre de Mach  

The ratio of the speed of a moving object to the → sound speed in the medium through which the object is traveling.

See also: Named after the Austrian physicist Ernst Mach (1838-1916); → number.