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Question

Derive the expression for excess pressure inside An air bubble

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Solution

Force due to surface tension:F=TL =T2πR ...... (1)Force due to excess pressure on each cross section of air bubble:F=PA =PπR2 ...... (2)Expression for excess pressure in air bubble:Equate the expressions (1) and (2):PπR2 = T2πRP=2TR

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