Part of speech:
The ratio of the speed of a body to the speed of sound in a particular medium, usually the Earth's atmosphere. For example, an aircraft flying through air at twice the speed of sound has a Mach number of 2. The Mach number of an aircraft travelling at a given velocity depends on the altitude of the aircraft and other atmospheric conditions that affect the speed of sound near the aircraft.
Find another word for mach-number. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for mach-number, like: mach, Mach one, Mach two, sonic speed, speed of sound and subsonic supersonic transonic.