What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire.

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Solution

The three essential requirements to produce fire are:
Fuel
Air
Heat
Fire extinguisher:
A fire extinguisher is used to control small fires.
A fire extinguisher contains chemicals such as Sulfuric acid $(H_{2} {SO}_{4})$ and Sodium bicarbonate $({NaHCO}_{3})$ .
Working of Fire extinguisher:
When the fire extinguisher is operated by pressing the knob, the sulphuric acid reacts with sodium bicarbonate solution leading to the production of carbon dioxide gas $({CO}_{2})$ .
The producing carbon dioxide is non-combustible. As the contact between the fuel and oxygen is cut off, the fire is controlled.

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