Why do we use nichrome wires in making coils for heating appliances.
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When heated in air, most metals then oxidize quickly, become brittle and break. Nichrome wire, when heated to red-hot temperatures, develops an outer layer of chromium oxide, which is thermodynamically stable in air, is mostly impervious to oxygen, and protects the heating element from further oxidation.
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Because of it's low cost of manufacture, strength, ductility, resistance to oxidation, stability at high temperature and resistance to the flow of electrons, nichrome is widely used in electric heating elements in applications such as hair dryers and heat guns
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