Why is foam – type fire extinguisher efficient in extinguishing fire due to electric short circuit? (b) Why does the paper cup with water not burn when placed on a Bunsen burner?
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Answer:a)foam fire extinguishers are not used to extinguish electrical fires
b)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.
Explanation:
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