Question

why we are applying oil on the higes of a door?​

Answer 1

Answer:

so that they cannot come in contact moisture

Answer 2

Explanation:

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