🔍 Key Concepts

• carbon dioxide (CO₂) fire-fighting properties compared to water (cooling vs smothering) • relative density of CO₂ vs air and how it behaves in a space • safety hazards of CO₂ systems to people in enclosed spaces and its effectiveness on flammable liquid (oil) fires

💭 Think About

• Think about the main way CO₂ actually puts out a fire: does it cool the fuel, remove oxygen, or remove heat like water? • Consider what happens to people inside a space when a fixed CO₂ system is discharged—would that ever be described as harmless? • For an oil fire, which agent is more suitable: water or CO₂, and under what condition does that agent work best?

✅ Before You Answer

• Check which option matches the true method of extinguishment for CO₂ (cooling vs smothering/displacing oxygen). • Eliminate any choice that contradicts what you know about CO₂ dangers to personnel in enclosed spaces. • Verify which statement correctly describes CO₂ performance on flammable liquid (oil) fires, especially when used quickly and in sufficient quantity.