Discussion
The machmeter displays
Answer: C
Correct answer: The ratio of true airspeed to the local speed of sound
Mach number is by definition the ratio of the aircraft’s speed to the speed of sound in the air it is flying through. Both quantities change with altitude and temperature, which is why Mach rather than airspeed governs compressibility effects - an aircraft can reach a critical Mach number at a true airspeed that would be quite unremarkable near sea level.
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