PDF chapter test TRY NOW
Give long answers to the following question:
What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire.
Three basic requirements to produce fire are as follows:
(i). Fuel (combustible substance)
(ii). Air (or oxygen) and
(iii). Heat to acquire the .
The role of a fire extinguisher is to cut off the supply of to bring down the temperature of the fuel or both.
The most common fire extinguisher is . But water works only when things like wood and paper are on fire. Water extinguishes fire by cooling the burning substance.
For fires involving electrical equipment and combustible materials like petrol, then carbon dioxide (CO2)is the best extinguisher.
being heavier than oxygen covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire can be controlled. The added advantage of is that it does not harm the electrical equipment in most cases.
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