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I am doing a quick calculation on how to calculate the pressure needed to inflate a perfectly spherical balloon to a certain volume, however I have difficulties with the fact that the balloon (rubber) has resistance to stretching and how this affects the pressure needed. It has to do with the E-modulus of the material I think, but I can not think of a proper way to calculate it.

EDIT: Looking for a few hours in my materials books now, but after posting it here I found an answer online already:

This one has an example in it which actually answers my question.

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You should write an answer to your own question. – Ron Maimon Sep 3 '11 at 20:43

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