Class-VIIPower Point Presentation

HUKAM CHAND T.G.T ENGLISH

K.V MATHURA CANTT

WHAT IS A FIRE?• FIRE is the result of

chemical reaction.• When the oxygen in the

air combines with • Carbon and hydrogen in

a fuel, a chemical reaction takes place. Energy in the form of heat and light is released in this process. This is what we call fire.

What are the three things needed to make a fire?

• 1.Fuel

• 3.Heat

2.oxygen

Uses of fire

• 1.Cook our food.• 2.warm our homes in

winter.• 3.generate electricity.

Three main ways in which fire can be put out :

• 1.Take away the fuel.• 2.Prevent oxygen

from reaching it.• 3.Remove the heat.

What is the best thing to fight an electric fire?

• CARBON DIOXIDE EXTINGUISHER

FIRE FIGHTERS

• They are highly trained people.• They cut off electricity supply.• Knock down dangerous walls.• Spray water and other materials to bring

fire under control.

Match the following• A B• 1.FUEL Lighted matchstick• air • 2.oxygen coal

• 3.heat burning coal• wood• smouldering paper• cooking gas

Rearrange the sentences in correct order

• 1.That is fire.• 2.A chemical reaction takes place.• 3.Energy in the form of heat and light is

released.• 4.Oxygen combines with carbon and

hydrogen.