Aiims exam question

Question

Two soap bubbles have radii in the ratio 2 : 1. What is the ratio of excess pressure inside them?

Naaz Baash · Answer

1:2

Deepshikha Rawat · Answer

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  MicrosoftInternetExplorer4
  
   
   
   
   
   
   
   
   
   
   
   
  
Excess pressure inside a bubble of radius R and surface tension T is given by $P_e\:=\:\frac{4T}{R}$.Therefore excess pressure is inversely proportional to the radius.So $\frac{P_1}{P_2}\:=\:\frac{R_2}{R_1}\:=\:\frac{1}{2}$.So the ratio of excess pressure inside them will be 1:2.