Question
(a) The pressure inside an alveolus with a $2.00 \times 10^{-4} \textrm{ m}$ radius is $1.40 \times 10^3 \textrm{ Pa}$, 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.)
1. $0.0700 \textrm{ N/m}$
2. This fluid is probably water at $37^\circ \textrm{C}$
Solution Video