Question

If two soap bubbles of different radii are connected by a tube,

• A. air flows from bigger bubble to the smaller bubble till the sizes become equal
• B. air flows from bigger bubble to the smaller bubble till the sizes are interchanged
• C. air flows the smaller bubble to the bigger
• D. there is no flow of air

Answer 1

The correct option is C

air flows the smaller bubble to the bigger

As the pressure difference inside a soap bubble as compared to its outside, is inversely proportional to its radius
$\Delta P\alpha \frac{1}{r}$
$\Rightarrow$ more pressure is there in a smaller soap bubble.
So air will flow from small radii bubble to the larger one .