Question

6. As a model of an airway, consider a cylindrical tube coated with a thin layer of liquid and an air-filled lumen in which the air flow is slow enough to be negligible. The air pressure inside the airway is constant and has a value Pairway- 0 (gage pressure). The air-liquid interface has surface tension σ = 60 dyne/cm. The airway is at generation 7 and has a diameter approximately 0.00220 m. Hint: I dyne-105 N. The liquid layer is uniform with a thickness of 0.000110 m, as shown in Figure 1. What is the pressure inside the liquid layer? Air 0.000110 nm Airway Wall Liquid Layer Air-Liquid Interface Figure 1. Schematic of airway and liquid layer coating the inside of the airway. Side-view of airway with uniform liquid layer.

Answer 1