There is no plural for the noun 'mach'; the different levels of mach are usually shown by a numeral for various speeds, such as mach 1 or mach 2.
SST, or SSTS (plural)
The mach number is the speed, compared to the speed of sound in air. Thus, mach 1 is the speed of sound, mach 2 is twice (2 times) the speed of sound, mach 3 is 3 times the speed of sound, etc.
Maximum speed: Mach 0.96Operating speed: Mach 0.89
the Mach number
To mach for you if you cant spell it.
Ernst Mach .
The homophone for "mach" is "mock."
Mach 2.
Speeds faster than Mach 1 are measured in multiples of Mach, such as Mach 2 (twice the speed of sound), Mach 3 (three times), and so on. Each Mach number represents the speed of an object in relation to the speed of sound.
No Mach 2.3
Mach 3 is 2283.6211 mph because Mach 1 equals 761.207033 mph.
Mach 889 is about 659,233 mph