Why does oil spreads over the surface of water but water does not spread over the surface of oil?
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The surface tension of water is more than tgat of oil. Therefore, when oil is poured over water, the greater value of surface tension of water pulls oil in all directions and spreads over the surface of 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 not able to pull water over it.
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