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Fires

Boiling water...

Question

Boiling water can extinguish fire more quickly then ice or cold water. Why?

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Solution

The process of fire extinguishing involves absorption of heat. Absorption of heat in converting hot water to steam is more than the heat absorbed in heating cold water to the boiling temperature. Hence boiling water can extinguish fire more quickly then ice or cold water.

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Q. Assertion :Hot water extinguishes fire more quickly than cold water. Reason: Hot water being at higher temperature is converted to steam in lesser time which by stopping combustion extinguishes the fire.

Q.1 Give reasons-

1. HOT WATER EXTINGUISHES FIRE MORE QUICKLY.

2. EXPOSED WATER PIPES BURST DURING A SEVERE FROST.

Q.2 WHY DOES EVAPORATION ALWAYS PRODUCE COOLING?

Q. Which of the following are correct results of high specific latent heat of ice?
a.Drinks cool more quickly on addition of ice cold water than ice
b.It is more cold after a hail-storm than during the hail-storm
c.All the water in the lake freezes at once in cold countries

Q. Would you cool a bucket of water more quickly by placing it on ice or by placing ice in it ? Give reasons for your answer.

State True or False.

On hills, water boils quickly.

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