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Drive an expression for excess of pressure inside a liquid drop.

Drive an expression for excess of pressure inside a liquid drop.

Grade:10

1 Answers

Arun Kumar IIT Delhi
askIITians Faculty 256 Points
6 years ago
Hello Student,

It is because of surface tension that pressure of a liquid increases within a bubble. Consider making free-body diagram of a bubble. If the force due to surface tension at the edge is balanced by the pressure force inside the bubble, we have
2 pi R sigma =p pi R^2
=>p=2 sigma /R
where sigma is surface tension and R is radius of the bubble and p is pressure difference.in case of soap bubble its double because that has double bubble layer.

Thanks & Regards
Arun Kumar
Askiitians Faculty
IIT Delhi

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