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Mach I is 760 mph at sea level. What is Mach I at 36,000 feet?

Question #257. Asked by l.

Answer has 6 votes
Currently Best Answer
23 year member
232 replies

Answer has 6 votes.

Currently voted the best answer.
Sound travels faster in the more dense air at sea level than in the thinner air high above Earth. It ranges from about 760 mph at sea level to approximately 660 mph at 36,000 feet. Sound travels even faster in water.

Mar 30 2000, 5:49 PM
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