why are the tools and machine parts made of iron smeared with grease and oil ?
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Answer. 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.
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Answer:
becoz when machines work thier parts become rusty and weak then it does not work properly.Grease and lubricant prevent it.
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