Question

we can prepare tea in paper cup and it Will not catch fire why

Answer 1

This is because when we heat the paper cup containing water, then the heat supplied to the paper cup is transferred to water inside it by conduction. Due to continuous transfer of heat from Paper Cup to water , the paper cup does not get heated to its ignition temperature. Hence the paper cup does not catch fire.
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Answer 2

Answer:

This is because when we heat the paper cup containing water, then the heat supplied to the paper cup is transferred to water inside it by conduction. Due to continuous transfer of heat from paper cup to water,the paper cup does not get heated to its ignition temperature. Hence, the paper cup does not catch fire.