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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 aluminium pipe does not.
Asked by Subhasish Last Modified
Answer (a) Water is a good conductor of electricity. If it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock. Also, water can damage electrical equipments.
(b) LPG is a better domestic fuel as it does not produce smoke and un-burnt carbon particles, which cause respiratory problems.
(c) A piece of paper wrapped around aluminium pipe does not catch fire easily. This is because aluminium, being a metal, is a good conductor of heat. Therefore, heat is transferred from the paper to the metal and the paper does not attain its ignition temperature.
read lessc)The paper by itself catches fire quickly because of its low ignition temperature piece of paper wrapped around an aluminium pipe doesn’t catch fire because aluminium is a good conductor of electricity.iWhile the paper wrapped around an aluminium pipe results in an increase in ignition temperature. So there is a transfer of heat from paper to the aluminium pipe. Hence it doesn’t catch fire.
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