🔍 Key Concepts

• Primary extinguishing mechanism of CO₂ on Class B and electrical fires • Difference between smothering, cooling, and chemical inhibition • Whether CO₂ significantly lowers the fuel temperature

💭 Think About

• When CO₂ is released onto a fire, what happens to the oxygen concentration around the flames? • Does CO₂ absorb a lot of heat from the burning material, or does it mainly affect the atmosphere around the fire? • Which common extinguishing agents are known for cooling versus chemical chain reaction interruption?

✅ Before You Answer

• Identify which choice best matches CO₂’s main method of extinguishing, not minor side effects • Recall that CO₂ does not leave a residue and is often used on electrical and machinery space fires • Confirm whether CO₂ is known for large temperature reduction of fuel or primarily for changing the surrounding gas composition