🔍 Key Concepts

• CO₂ extinguishers work by displacing oxygen and cooling the fuel surface • Effective firefighting focuses on the fuel source, not the visible flames • The goal is to prevent re‑ignition by treating where combustion is actually occurring

💭 Think About

• Ask yourself: Where is the burning fuel actually located in a typical fire – in the flames, or somewhere else? • Which part of the fire must you cool and smother to stop the chemical chain reaction of burning? • If you only hit the visible flames, what will happen when you stop discharging the extinguisher?

✅ Before You Answer

• Identify which option targets the fuel, not just the flames • Choose the option that would most likely stop re‑ignition after you release the handle • Eliminate any option that focuses mainly on the top or highest part of the flames rather than where they come from