Why few drops of oil are poured on the hinges of the door?

Few drops of oil are poured on the hinges of a door, the door moves smoothly by reducing friction.

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becoz it acts as a lubricant and makes door easy to push and pull

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Oil is a lubricant. it helps to reduce friction by being applied over the irregularities of a surface. So, there is no interlocking of irregularities, so, friction reduces, and the door moves smoothly.

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