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How fast is the sound barrier?

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ANSWER

The speed at which you break the sound barrier depends on many conditions, including weather and altitude. It’s approximately 770 mph or 1,239 kmh at sea level.

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The speed at which sound travels is known as the sound barrier. The speed of a sound wave actually varies with temperature and air density, increasing about 0.6 m/s for every Centigrade degree temperature increase. At 68° F the speed of sound is about 343 m/s or 767 mph at sea level.

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