What does Mach 1 mean in physics?

Date:2023-01-07
Mach 1 is the speed of sound in a given medium. It is equal to approximately 343 m/s (1,125 ft/s) in air at sea level, and decreases with altitude as the air temperature decreases. Mach 1 is also sometimes referred to as the 'sound barrier', due to the difficulty in achieving such speeds.
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