What is the sound barrier?
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This was known as the sound barrier because it was an obstacle to high-speed flight. When the aircraft exceeds the speed of sound, it leaves the built-up waves of pressure behind, and these break away, forming a 'sonic boom’.
The speed of sound in air is called Mach 1, and the speed of supersonic aircraft is measured in Mach numbers.
Concorde is the only commercial aircraft to have broken the sound barrier.
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Date Added: 13 December '11
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