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COMBUSTION AND FLAME - Coggle Diagram
COMBUSTION AND FLAME
FIRE EXTINGUISHERS
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Foam Extinguishers
As with water extinguishers, foam extinguishers have a cooling effect on the fuel. On burning liquids, the foaming agent creates a barrier between the flame and the fuel, extinguishing the fire.
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Water Extinguishers
The water has a cooling effect on the fuel, causing it to burn much more slowly until the flames are eventually extinguished.
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.
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INFLAMMABLE SUBSTACES: Those materials which have low ignition temperature and catch fire easily are termed as inflammable substances. Example includes petrol, LPG, etc.
Those substances which provide energy on burning are called 'fuels'; e.g., coal, petroleum, LPG, etc
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PARTS OF A FLAME
Outermost zone: It is blue in color and is hottest amongst all the zones. In this portion, complete combustion takes place.
Middle zone: It is yellow in color and is somewhat hot. In this portion, partial combustion takes place.
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Combustible Substance
:Any material that undergoes combustion is called a combustible substance. It is also called as fuel. Some examples of fuels are petrol, diesel, etc. The fuel may be in solid, liquid or gas state. Sometimes, light is also given off during combustion, either as a flame or as a glow.