Quote:
Originally Posted by Al Skierkiewicz
Explain how the volume of gas will somehow expand the balloon and fill it if all pressures are equal.
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Add molecules at constant pressure to a flexible but inelastic container. The volume increases. I don't see how this is an open question.
A typical mylar balloon has exactly ambient atmospheric pressure inside it. If you manage to defeat the fill port's built-in leakage and overfill it so that it's starting to swell, it actually becomes less buoyant. After a couple of hours, it will have leaked back to ambient pressure.