NEET 2022, Physics Q12: Properties of Fluids

NEET2022Physics

If a soap bubble expands, the pressure inside the bubble :

Solution

Excess pressure inside a soap bubble: $P = P_{0} + \frac{4 T}{R}$ , where $T$ is surface tension and $R$ is the bubble's radius.

As the bubble expands, $R$ increases, so the term $\frac{4 T}{R}$ decreases and the inside pressure $P$ decreases.

Concept behind this question

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