Why does an explosion make noise?
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Explosions create a shockwave. A shockwave is like a soundwave, but really really extreme. A pressure wave expanding outwards.
This pressure wave bounces off of everything it strikes, creating a “new” wave. Now instead of one wave, you have countless tiny waves from every source.
Between our original shockwave and its echoes, you have a whole host of waves, which is sound.
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