CO2 extinguishes fire by ______?

CO2 extinguishes fire by ______?

• A. Displacing oxygen
• B. Cooling the fuel surface
• C. Forming a protective blanket
• D. Releasing halogens

Answer: (A)

CO2 extinguishes fire by displacing oxygen in the surrounding air. CO2 is denser than air, so when it’s released it blankets the flame and lowers the concentration of usable oxygen, making it hard for combustion to continue. The cooling effect is not the primary mechanism here, and CO2 doesn’t form a protective blanket in the way some other extinguishing agents do. It also doesn’t release halogens. This method is most effective in small, contained fires with people able to be kept out of the area, but it’s less effective in open spaces and can pose a danger to anyone present.

CO2 extinguishes fire by displacing oxygen in the surrounding air. CO2 is denser than air, so when it’s released it blankets the flame and lowers the concentration of usable oxygen, making it hard for combustion to continue. The cooling effect is not the primary mechanism here, and CO2 doesn’t form a protective blanket in the way some other extinguishing agents do. It also doesn’t release halogens. This method is most effective in small, contained fires with people able to be kept out of the area, but it’s less effective in open spaces and can pose a danger to anyone present.