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How does water help in extinguishing the fire ?
Water helps in extinguishing the fire in two ways :
(i) It brings the temperature of the combustible material below its ignition temperature. As a result, the fire gets extinguished.
(ii) The water vapour formed due to the heat of fire cuts to supply of air. Due to the absence of air (supporter of combustion), the fire gets extinguished.
Explain how the use of CNG in automobiles has reduced pollution in our cities.
Compare LPG and wood as fuels.
Give reasons :
Water is not used to control the fire involving electrical equipment.
Give reasons :
LPG is a better domestic fuel than wood.
Give reasons :
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
Make a labelled diagram of candle flame.
Name the unit in which the calorific value of a fuel is expressed.
Explain how CO2 is able to control fires.
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Which zone of a flame does a goldsmith use for melting gold and silver and why ?
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