Carbon Dioxide Fire Extinguisher is suitable for Class B or C fires because it:

Carbon Dioxide Fire Extinguisher is suitable for Class B or C fires because it:

• A. Controls heat
• B. Smothers by removing air
• C. Air by dilution
• D. Reacts chemically to extinguish fire

Answer: (C)

Carbon dioxide extinguishing works by displacing air, diluting the oxygen around the flame so the fire can’t sustain combustion. Because CO2 is denser than air, it quickly blankets the fire, starving it of the oxygen it needs. This makes CO2 good for Class B liquids and Class C electrical fires: it suppresses the flame without leaving residue and without conducting electricity. The cooling effect is minimal, and there’s no chemical reaction to extinguish the fire. While some describe “smothering” as removing air, the key mechanism here is dilution of the surrounding air with CO2.

Carbon dioxide extinguishing works by displacing air, diluting the oxygen around the flame so the fire can’t sustain combustion. Because CO2 is denser than air, it quickly blankets the fire, starving it of the oxygen it needs. This makes CO2 good for Class B liquids and Class C electrical fires: it suppresses the flame without leaving residue and without conducting electricity. The cooling effect is minimal, and there’s no chemical reaction to extinguish the fire. While some describe “smothering” as removing air, the key mechanism here is dilution of the surrounding air with CO2.