Why does the mach limit lower the higher you travel?
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I looked up the coffin corner for the U-2, and the mach limit as it reaches 70,000 is 110 knots indicated airspeed. but isn’t the speed of sound above 600 knots? How does the u-2 reach the mach limit?
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Air density is lower at higher altitudes. Air density is a big factor for the speed of sound in air, so it changes too.
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