Mach numberMach number
[alsom- n-] a number representing the ratio of the speed of an object to the speed of sound in the surrounding medium, as air, through which the object is moving
Origin of Mach numberafter E. Mach (1838-1916), Austrian physicist
also mach number
The ratio of the speed of an object to the speed of sound in the surrounding medium. For example, an aircraft moving twice as fast as the speed of sound is said to be traveling at Mach 2.
Origin of Mach numberAfterErnst Mach
After the physicist Ernst Mach.