First slide

Surface tension

Question

A soap bubble is blown with the help of a mechanical pump at the mouth of a tube. The pump produces a certain increase per minute in the volume of the bubble, irrespective of its internal pressure. The graph between the pressure inside the soap bubble and time t will be

Moderate

A
B
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D

Solution

$∆ P = \frac{4 T}{r} ∴ ∆ P \propto \frac{1}{r}$
As radius of soap bubble increases with time
$∴ ∆ P \propto \frac{1}{t}$

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