Mach vs. much
Mach /mɑːk/
(a unit for measuring speed by comparing it to the speed of sound)
- The goal was to fly at Mach 2, or twice the speed of sound.
- The maximum speed of this new fighter is Mach three. [Three times the speed of sound]
much /mʌtʃ/
(a large amount; a large degree)
- It doesn’t cost much.
- I feel much better today.