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Find the excess pressure inside a liquid drop?

Find the excess pressure inside a liquid drop?

Grade:upto college level

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
6 years ago
237-2025_pressure.gif
It is because of surface tension that pressure of a liquid increases within a bubble. Consider the free-body diagram of a bubble as shown in Fig. 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}
i.e
P=\frac{2\sigma }{R}
where p is the pressure difference between inside the drop and that outside. In addition the pressure inside the bubble is greater than that outside.
Thanks and Regards
Apoorva Arora
IIT Roorkee
askIITians Faculty

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