If a soap bubble expands, the pressure inside the bubble [2022]

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Solution

Q.
If a soap bubble expands, the pressure inside the bubble [2022]

1 decreases

2 increases

3 remains the same

4 is equal to the atmospheric pressure

Ans.
(1)

The excess pressure inside a soap bubble is

$P_{i} = \frac{4 T}{R} + P_{o}$

where, $P_{i} \to$ inside pressure, $P_{o} \to$ outside pressure

$T =$ surface tension and $R$ is radius.

Here, $P_{o}, T$ is constant, so when $R$ increases, $P_{i}$ decreases.

So, the pressure inside the bubble decreases.

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