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What is the gauge pressure of the air inside an alveolus having a radius of 250 m if the surface tension of the fluid-lined

What is the gauge pressure of the air inside an alveolus having a radius of 250 m if the surface tension of the fluid-lined wall is the same as for soapy water (37), and the gauge pressure in the fluid lining of the alveolus is 15 mm Hg. Give your answer in units of Pa.

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