MCQ
$CO_2$ extinguishers help extinguish fires by.
- ACutting supply of nitrogen.
- BLimiting the supply of fuel.
- ✓Cutting the supply of oxygen.
- DReducing the heat of surroundings.
✓
Answer
Correct option: C.
Cutting the supply of oxygen.
Carbon dioxide is a non-conductive and non-corrosive gas used to reduce the amount of oxygen available to the fire. It is heavier than air, hence when $CO_2$ extinguishers are used $CO_2$ replaces the air from the surface of fire and thus cuts the supply of oxygen. In this way, it helps in extinguishing the fire.
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