Question

Give reason- 2

a) A paper cup containing water does not catch fire on heating.

b) If the clothes of a person catch fire, the person should be

immediately wrapped in a thick blanket.​

Answer 1

Answer:

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.

Answered By

Answer 2

Answer:

(a)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.

(b)When clothes of a person catch fire, his body is covered with blanket to stop the supply of oxygen. Air (oxygen) is essential for combustion. In the absence of air, combustion will not occur. Hence, the fire will be extinguished.

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