Why do a number of droplets coalesce to form a bigger drop?
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If two liquid drops coalesce then there will be decrease in surface area,simultaneously there will be decrease in surface energy hence energy is liberated.
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A large number of droplets, each of radius a, coalesce to form a bigger drop of radius b. Assume that the energy released in the process is converted into the kinetic energy of the drop. The velocity of the drop is (σ=surface tension, ρ=density)
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