Mach number also mach number (mäk)
n. Abbr. M
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.

[TahlilGaran] American Dictionary ▲

mach number
[After Mach, Ernst.]

[TahlilGaran] American Dictionary ▲