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Question

If more air is pushed in a soap bubble, the pressure in it
  1. decreases
  2. increases
  3. remains same
  4. becomes zero


Solution

The correct option is A decreases
We know that pressure inside soap bubble is given by
P2=P1+4TR, where T is surface tension and P1 is outside pressure.


P21R
As more air is pushed into a soap bubble, its volume will increase. This increases the radius of the soap bubble. 
Therefore, pressure inside it will decrease.

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