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(B) According to the equation of continuity,$A_1 v_1 = A_2 v_2$. In the narrow region,the cross-sectional area $A$ decreases,so the velocity $v$ of th

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move with greater speed and are larger in size than in the rest of the pipe

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(B) According to the equation of continuity,$A_1 v_1 = A_2 v_2$. In the narrow region,the cross-sectional area $A$ decreases,so the velocity $v$ of the fluid increases $(v \propto \frac{1}{A})$.According to Bernoulli's principle for a horizontal pipe,$p + \frac{1}{2} ho v^2 = 	ext{constant}$. Since the velocity $v$ increases in the narrow region,the pressure $p$ must decrease.As the external pressure on the air bubbles decreases in the narrow region,the air inside the bubbles expands,causing the bubbles to become larger in size. Thus,the bubbles move with greater speed and are larger in size.

Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region,the bubbles

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