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Give reason : Paper by itself catches ...

Give reason : Paper by itself catches fire easily whereas a piece of paper wrapped around an aluuminium pipe does not,

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Paper catches fire easily, but when it is wrapped around an aluminium pipe and heat is supplied then in presence of aluminium pipe, the ignition temperature does not meet because heat given to it is passed to aluminium pipe which lowers the temperature of the paper wrapped around it. That is why paper does not catch fire.
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