The force of surface tension of some oil is less than surface tension of water. When such oil are dropped on the surface of waiter, they are pulled in all water and as such they spread uniformly on water. In the case of other oils, whose surface tension is equal to or greater than that of water, they float as drops on water. The oil slick formed may remain cohesive, or may break up in the case of rough seas. Waves, water currents, and wind force the oil slick to drift over large areas, impacting the open ocean, coastal areas, and marine and terrestrial habitats in the path of the drift. 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.On the other hand,when water is poured over oil,it does not spread over it because the surface tension of oil being less than that of water,is