noun(the sound barrier)
The increased drag, reduced controllability, and other effects which occur when an aircraft approaches the speed of sound, formerly regarded as an obstacle to supersonic flight.
- On its third flight, the aircraft broke the sound barrier, reaching a speed of Mach 1.1.
- The shock waves set up when you go through the sound barrier also add to drag.
- As a result, an aircraft creates a sudden discontinuity in pressure and temperature called a shock wave as it breaks the sound barrier.
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