It’s easier to go Mach 2 at 50000 feet than it is at 25000 feet. Or so I hear.
In: Physics
True air speed, which is the speed you’re travelling through the airmass itself, and on a day with no wind, will be the same as your ground speed. Besides used for calculating Mach speed, and estimates for points/destinations (adding the wind component), it isn’t really used.
Mach number is for an aircraft a limiting factor when it comes to compressibility at lower altitudes, to high a mach number, and the aircraft starts doing strange things.
Lower altitudes, Indicates/Calibrated airspeed is limiting factor, exceed the maximum CAS, and you may rip off the wings.
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