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They are saying that the "extra molecules" that pressurize the air
inside the balloon are what you "hear" when the air expands outward
rapidly with the release of the air. (PV=NRT, increase N and you
increase P and slightly increase V.) I.e., this pressure moves outward
and your ears respond by giving the sensation of a "bang." This is a
conservation of air molecules argument that implies that the extra air
molecules that are released have to go somewhere and as they escape they
cause a local increase in air pressure that your ears hear since the air
pressure momentarily increases at your ears as the molecules in the
surrounding air adapt to the extra molecules you just released.
This argument makes no sense to me and without actually calculating the
increase in the air pressure 100 meters away, I just don't see that it
would be a very loud pressure sensation to your ear.