What is another word for Mach Number?
Pronunciation: [mˈɑːk nˈʌmbə] (IPA) 
The Mach number is a dimensionless quantity that measures the speed of an object in relation to the speed of sound in a particular medium. There are a number of synonyms for the Mach number, including Mach speed, Mach velocity, and Mach ratio. In addition, the term "supersonic" is often used to describe speeds that are greater than the speed of sound, while "subsonic" is used to describe speeds that are less than the speed of sound. Other related terms include "sonic boom," which is the sound created by an object traveling at or above the speed of sound, and "transonic," which refers to speeds that are close to but not quite equal to the speed of sound.
