First slide
Surface tension
Question

 An air bubble is formed at a depth h inside the container of a soap solution of density ρ. If T be the surface tension of the soap solution and Po, the atmospheric pressure, then the total pressure inside  the bubble will be 

Moderate
Solution

Total pressure inside the soap bubble when it is formed at a depth h inside the container of soap solution = atmospheric pressure + pressure due to a height h of soap solution + excess of pressure =P0+ρgh+(2T/r)

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