Mach number
noun
\ ˈmäk-
\
\
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)
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More Definitions for Mach number
Mach number
noun
\ ˈmäk-
\
\
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