Explain why oil spreads over water
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The surface tension of the water is more than that of oil. Therefore,when oil is poured over water,the greater value of surface tension of water pulls oil in all directions,and as such it spreads on the water.
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Surface tension of oil is less than that of water. When oil is dropped on the surface of water, the force of surface tension of water being larger than that of oil, stretches the oil drops on all sides. Hence the oil spreads over the surface of water.
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