
Concept explainers
Several air bubbles are present in water flowing through a pipe of variable cross-sectional area (Figure Q14.9). What happens to the volume of an air bubble when it arrives at the narrow part of the pipe, where the cross-sectional area is half that of the wider part? Assume the temperature of the gas in the bubble stays constant.
a. The volume of the bubble remains unchanged because water is incompressible.
b. The volume of the bubble remains unchanged because the temperature of the gas in the bubble is constant.
c. The volume of the bubble decreases because the pressure in water increases.
d. The volume of the bubble increases because the pressure in water decreases.

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