Give reasons Water is not used to control fires involving electrical equipments. LPG is a better domestic fuel than wood. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does n

cbse
cbse-class-8-science
combustion-flame

#1

Give reasons

  1. Water is not used to control fires involving electrical equipments.
  2. LPG is a better domestic fuel than wood.
  3. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Answer:

  1. 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.
  2. LPG is a better domestic fuel as it does not produce smoke and unburnt carbon particles, which cause respiratory problems.
  3. 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.