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mach
Definitions
[mɑːk], (Noun)
Definitions:
- the ratio of the speed of a body to the speed of sound in the surrounding medium. It is often used with a numeral (as Mach 1, Mach 2, etc.) to indicate the speed of sound, twice the speed of sound, etc.
(e.g: the missiles can reach speeds of Mach 10)
Phrases:
Origin
:
1930s (as Mach's number): named after Ernst Mach (see Mach, Ernst)
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definition by Oxford Dictionaries