fromla of excess pressure inside a liquid drop
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height*density of liquid *gravity
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If T is the surface tension of the liquid, the force due to surface tension acting downward along the circumference of the circle ABCD is T 2πr.
At equilibrium, P πr2 = T2πr
P = 2T/r
At equilibrium, P πr2 = T2πr
P = 2T/r
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