Eli5: What is the sound barrier?
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It is simply the speed of sound, there is no barrier, its more just a figure of speech.
Breakibg the sound ‘barrier’ is simply a cpmmon way to state “your velocity has increased to the point it now exceeds the velocity of a sound wave”.
There are some cool things that occur when this happens. An object will generate massive shockwaves as it passes this speed which generates a sonic boom, but there is no physical or engineering barrier.
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