I'm just wondering if there's a pressure difference between the atmosphere and the air inside the balloon due to the rubber elasticity. A kind of analogous to the Laplace pressure in soap bubbles.
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Do you think that any force is required to keep the balloon in a stretched position? If so, can you guess the source of that force? – James Nov 10 '15 at 15:37
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5Possible duplicate of Relationship between balloon size and pressure – John Rennie Nov 10 '15 at 16:33