Fire- Friend and Foe

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Slide 1: 

Mangla minj

Fire: Friend and Foe : 

Fire: Friend and Foe Fire is the result of a chemical reaction. When the air combinations 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.

Fuel, oxygen and heat. wood, coal, cooking gas and petrol are some example of fuel. Oxygen comes from the air. The third thing needed to make fire is heat. : 

Fuel, oxygen and heat. wood, coal, cooking gas and petrol are some example of fuel. Oxygen comes from the air. The third thing needed to make fire is heat. Three things are needed to make fire

Fire : our friend : 

Fire : our friend We use it to cook our food, warm our homes in winter and generate electricity.

Fire : our foe : 

Fire : our foe When it gets out of control it can be very dangerous. Homes and shops are damaged by fire. Vast area of forest are also destroyed and hundreds of people are killed and injured.

Things needed to put out fire : 

Things needed to put out fire Just as three things are needed to start a fire. There are three main ways in which a fire can be put out. The first way of putting out the fire is to take away the fuel.

The second way of putting out a fire is to prevent oxygen from reaching it. No supply of oxygen means no fire. : 

The second way of putting out a fire is to prevent oxygen from reaching it. No supply of oxygen means no fire.

The third way of putting out a fire is to remove the heat . If the temperature can be brought down below the flash point, the fuel stops burning. : 

The third way of putting out a fire is to remove the heat . If the temperature can be brought down below the flash point, the fuel stops burning.

Some times water is sprayed on a fire to put it out , but same fires can not be put out with water.e.g. oil fire and fire caused by electrical appliances. : 

Some times water is sprayed on a fire to put it out , but same fires can not be put out with water.e.g. oil fire and fire caused by electrical appliances.

The role of fire fighter: : 

The role of fire fighter: They are highly trained people. They possess many spills. They cut off electricity supply, knock down dangerous walls, spray water and other materials to bring fire under control.

Conclusion: : 

Conclusion: The discovery of fire and its uses helped early man to cope up with nature better and gradually adopt a settled mode of life . Fire is indeed a threat once it gets out of control.

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