Why are tools and machine parts made from iron smeared with grease or oil???
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The tools are smeared with oil and grease to increase the smoothness or when it is cooking in a a fire, to make sure it is not getting rusted. They are also protected by coating a thin layer of zinc on them. This process is known as galvanization. It is basically a hack to protect the iron tools.
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Explanation:
Machine parts made put of iron are smeared with grease or oil to prevent the iron from rusting.
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