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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The bang sound is a pressure wave with all the internal air under pressure suddenly being released. It’s not the balloon material making the sound.
When a balloon doesn’t have that kind of pressure, after a few days for example, you can put a hole in it without a bang sound.
Keep in mind nearly all sounds you hear with your ears are due to differences in air pressure.
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