When I watch a balloon pop in slow motion, the material appears to tear and contract instead of exploding. It seems like if it were to make any sound then that sound should be a tearing sound.
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All sound is is just a pressure wave.
The balloons internal pressure needs to be able to withstand the external air pressure, plus the elastic compression of the balloon. That means there’s slightly higher pressure inside than outside the balloon. When the balloon pops, all of that pressure is released at once, resulting in a quick loud sound, or a bang.
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