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The total surface area of the alveoli of the adult human lung is about 80m^2. if...

The total surface area of the alveoli of the adult human lung is about 80m^2. if this expands 5% on inhalation, how much work must be done to increase the area of the film lining the lungs if the surface tension of the liquid in the film is 1.0 x 10^-3 N/m? The answer is 4.0 x 10^-3 J

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