Explain with the help of an activity how water gets boiled in a paper cup without burning it.
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Water can be boiled in a paper cup because, the heat energy supplied to paper cup rapidly passes on to water. Thus, ignition temperature of paper is not achieved and, hence, it does not catch fire.
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When paper cup is heated containing water, water absorbs the heat coming from the burning source and thus prevents the paper from reaching its ignition point. Hence it does not burn. Water in the cup becomes hot instead. This is due to absorption of heat by water.
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