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Unread 30-03-2013, 12:47
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Re: Are we allowed to use helium?

Quote:
Originally Posted by Al Skierkiewicz View Post
Explain how the volume of gas will somehow expand the balloon and fill it if all pressures are equal.
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.
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