Eli5: What is the sound barrier?
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It’s just a term for the speed of sound in whatever media you/the sound are traveling in. (Since the speed of sound is different in air than in water).
It’s not really a “barrier”, and you don’t really “break” anything when you pass the speed of sound. Those terms have just kinda been applied to it since it causes a sonic boom which sounds like something being broken through.
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