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The external cover of aeroplane is made up of aluminium instead of iron. Why?
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The external cover of aeroplane is made up of aluminium instead of iron. Why?

User Danny Pule
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Aluminium is lighter than Iron, Iron is 26 on the periodic table while Aluminium is 13, half of the weight.
User Zlajo
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The same volume of aluminum has a smaller mass than iron and aircrafts better be light.
User Curran
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