Question

Give reasons. ​
(a) Water is not used to control fires involving electrical equipment.​
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not.

Answer 1

(a) Water is a conductor of electricity, so it can easily conduct electric current and cause danger of electric shocks or short-circuits. Therefore, water can not be used to control the fire involving electrical equipment. ​

Water fire extinguishers are suitable for fighting fires involving solid combustibles.​

​(b)

LPG is a better domestic fuel than wood due to the following reasons:​

• LPG doesn’t release smoke ​

and other pollutants. Hence, it is a cleaner fuel.​

• Has better fuel efficiency than that of wood.​

Wood on other hand, produces a lot of smoke and pollution.​

(c) Paper catches fire easily due to its low ignition temperature. When it is wrapped around an aluminum pipe, being a good conductor of heat, it absorbs the heat supplied to paper and the paper does not attain its ignition temperature. As a result, the paper does not catch fire.​