What is the observation of heating water in a polythene bag on the burner
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A thin paper cup filled with water does not catch fire when placed over a flame because the paper cup does not become appreciably hotter than the water it contain.
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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