What Speed Breaks the Sound Barrier?

By Staff WriterLast Updated Apr 8, 2020 8:01:12 AM ET
NASA Goddard Space Flight Center/CC-BY-2.0

Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of sound also decreases.