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Applications of Surface Tension #8211; As Every system tends to have minimum potential energy, the surface of a liquid too tends to have minimum surface area. As sphere has the minimum surface area for a given volume, drops and bubbles tend to have spherical shape. Excess pressure for liquid drop(△p)<sub>d</sub> = 2S/r Excess pressure for soap bubble (△p)<sub>b</sub> = 4S/r
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