Physics
Mach Number Calculator
Find the Mach number from speed and speed of sound.
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The Mach number expresses speed relative to the local speed of sound.
The math behind it
M = v ÷ c. M = 1 is sonic, M > 1 supersonic, M > 5 hypersonic.
Worked Example
340 m/s where c = 343 → Mach 0.99.Frequently Asked Questions
Why does c change with altitude?
It depends on temperature, which varies with altitude.
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