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The speed of sound in air at 20 degrees Celsius (68 degrees Fahrenheit) is 343 metres per second. That is 1126.547 feet per second.
Notice: The speed of sound changes with temperature and

a little bit with humidity − but not with air pressure (atmospheric pressure).

The words "sound pressure at sea level" are incorrect and misleading.

The temperature indication, however, is absolutely necessary.

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15y ago

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