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How many MPH does an object have to go in order to break the sound barrier

User Nickelman
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Well, it's kind of a slippery number, because the speed of sound
depends on the air that the sound is traveling through, so it's actually
different for different aircraft flying at different altitudes, where the
pressure, temperature, and density of the air are different.

Here are some "standard" values"

On the ground . . . 761 mph

10,000 feet 733 mph

20,000 feet 705 mph

30,000 feet 677 mph

50,000 feet 660 mph

100,000 feet 676 mph

User Benjaminmgross
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