(a) The pressure inside an alveolus with a 2.00 x 10^-4-m radius is 1.40 x 10³ Pa, due to its fluid-lined walls. Assuming the alveolus acts like a spherical bubble, what is the surface tension of the fluid?

(b) Identify the likely fluid. (You may need to extrapolate between values in Table 11.3.)

Data given in Table 11.3

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Liquid Water at 0°C Water at 20°C Water at 100°C Soapy water (typical) Ethyl alcohol Glycerin Mercury Surface tension y(N/m) 0.0756 0.0728 0.0589 0.0370 0.0223 0.0631 0.465