What will happen to a balloon stretched over the mouth of a bottle when steel wool inside the bottle rusts?

The guy above is sharp, and I'm pretty sure he's right.
In real life, nothing will happen to the balloon because the balloon is slightly permeable, and air can pass through it, although slowly. Your birthday balloon will lose air faster than a chunk of steel wool in a jar will rust. Sorry to ruin your experiment.

But since rusting takes oxygen, and converts the gas into a solid, then a fixed volume of gas in the jar would shrink. The volume increase of the rust is negligible compared to the volume decrease of the gas.

That was a fun question, thanks.

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