TOPIC FIRE: friend and foe Class-VII LEKSHMI.N.NAIR T.G.T English, K.V.By No 1, Naval Base, Kochi. 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 2.Oxygen 3. Heat Uses of Fire • Cook our food. • Warm our homes in winter. • Generate electricity. Three main ways to put out fire • Take away the fuel. • Prevent oxygen from reaching it. • 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 1.Fuel 2.Oxygen 3. Heat • • • • • • • Lighted matchstick Air Coal Wood Burning coal Smouldering paper Cooking gas Rearrange the sentences in correct order • That is fire. • A chemical reaction takes place. • Energy in the form of heat and light is released. • Oxygen combines with carbon and hydrogen.