Science

Combustion and Flame


Burning of Fuels Leads to Harmful Products.


The increasing fuel consumption has harmful effects on the environment. 1. Carbon fuels like wood. coal,petroleum release unbumt carbon particles. These fine particles are dangerous ollutants causing respiratory diseases, such as asthma.2. Incomplete combustion of these fuels gives carbon monoxide gas. It is a very poisonous gas. It is dangerous to bum coal in a closed room. The carbon monoxide gas produced can kill persons sleeping in that room.Combustion of most fuels releases carbon dioxide in the environment. Increased concentration of carbon dioxide in the air is believed to cause global warming 4. Burning of coal and diesel releases sulphur dioxide gas. It is an extremely suffocating and corrosive gas. Moreover, petrol engines give off gaseous oxides of nitrogen. Oxides of sulphur and nitrogen dissolve in rain water and form acids. Such rain is called acid rain. It is very harmful for crops, buildings and soil. You have already learnt about it in Class VII. The use of diesel and petrol as fuels in automobiles is being replaced by CNG (Compressed Natural Gas), because CNG produces the harmful products in very- small amounts. CNG is a cleaner fuel.

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Notes


Combustion and Flame - Notes
1. What is a Fuel?
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2. Burning of Fuels Leads to Harmful Products.
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3. Types of Combustion
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4. Fuel Efficiency
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5. Flame
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6. What is Combustion?
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7. How do We Control Fire?
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