Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region, the bubbles
KVPY 2014Medium
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(b)
In narrow region, velocity of flow is more.
$v \propto \frac{1}{\text { Area }}$
As a result, pressure in narrow region is less.
As, $p+\frac{1}{2} \rho v^2=$ constant for a horizontal tube.
So, bubbles grow in size and they move fast through narrow region.
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