Liquids possess surface energy due to surface tension, which tends to minimize the surface area. When two smaller drops merge to form a larger drop, the total surface area of the liquid decreases. Since surface energy is proportional to surface area (Energy = Surface Tension × Area), a decrease in surface area results in a decrease in surface energy, and this energy difference is released, usually as heat.
Two drops of liquid merge to form a single drop. In this process energy is
Asked in WBPSC CS Prelims 2023 · Topic: Physical Properties of Materials (Viscosity and Surface Tension)
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