A paper burns easily when shown above the flame but does not when a metal coin is placed above it
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Answer: A paper burns easily when shown above the flame but does not when a metal coin is placed above it because papers have low melting point as compared to metal coin which has high melting point.
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It is so because of ignition temperature.
Ignition temperature:- The minimum temperature at which combustible substance ignites .
Ignition temperature of paper is low as compared to metal coin so paper burns easily but coin doesn’t.
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