how can water boil in a paper cup without burning it
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Paper ignites at a much higher temperature than the boiling point of water. The paper will ignite around 230 degrees Celsius and water boils at 100 degrees Celsius. Although the fire is hot enough to ignite the paper cup, the heat energy is absorbed by the water, causing it to boil.
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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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