A thin paper cup filled with water does not catch fire when placed over a flame. This is because:
water is an excellent conductor of heat
the paper cup does not reach to ignition temperature
the water cuts off oxygen supply to the paper cup
paper is a poor conductor of heat
A
paper is a poor conductor of heat
B
the paper cup does not reach to ignition temperature
C
the water cuts off oxygen supply to the paper cup
D
water is an excellent conductor of heat
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Solution
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On heating a paper bowl containing water, the water present in it absorbs the heat coming from the burning source and thus prevents the paper from reaching its ignition point. Hence, it does not burn. The water in the bowl becomes hot. This is due to the absorption of heat by the water.
Hence, option C is correct.
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