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Fire may have puzzled early man but we now know that fire is the result of a 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.Three things are needed to make fire-fuel, oxygen and heat. Wood, coal, cooking gas and petrol are some examples of fuel. Oxygen comes from the air. That is why, when you blow on smouldering paper, it often bursts into flame. The third thing needed to make fire is heat. Fuel and oxygen do not make fire by themselves, or else a newspaper or a stick lying in the open would catch fire on its own.(1) When does fire take place ?(2) Oxygen is very much available any time because …………..(3) Fuel and oxygen do not make fire by themselves. How can you say so? |
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Answer» (1) Fire is the result of a chemical reaction. When the oxygen in the air combines with carbon and hydrogen in a fuel, a chemical reaction takes place. (2) Oxygen is very much available any time because it stays in air. (3) Fuel and oxygen do not make fire by themselves. Fire requires three things all together to make it; they are fuel, oxygen and heat (fire). Absence of any one of these three fail to make a fire. If fire can be made without heat, everything in open will catch fire soon as fuel and oxygen are already available in open. |
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