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Mach attended the University of Vienna where he studied Physics.
https://plato.stanford.edu/entries/ernst-mach/ -
Mach earned his Doctorate in Physics under Andreas Von Ettingshausen, from the University of Vienna.
https://plato.stanford.edu/entries/ernst-mach/ -
Mach was a professor in Mathematics at the University of Graz, and was appointed Professor in Physics in 1866. During this time Mach continued his work in Psycho-physics and sensory perception during this time.
https://plato.stanford.edu/entries/ernst-mach/ -
Mach's most effective work was proving that when a bullet traveled faster than the speed of sound it would create a compression of air in front of it, also known as a shock wave. Mach invented an interferometer, that allowed for clear and precise photographs of these shock waves.
https://plato.stanford.edu/entries/ernst-mach/ -
Ackeret proposed the Mach number, named after the late Ernst Mach as the speed of sound, then followed by the number, For example Mach 0.5, is half the speed of sound while Mach 1.75, is 75% faster than the speed of sound.
https://en.wikipedia.org/wiki/Mach_number -