🔍 Key Concepts

• Carbon dioxide (CO₂) behavior in enclosed spaces • How CO₂ displaces oxygen and affects breathing • Difference between fire-extinguishing effect and direct physical injury

💭 Think About

• Think about what happens to the air in a small, closed compartment when a lot of CO₂ is suddenly released. • Consider which body system (skin, lungs, ears, or nerves) would be most directly affected by CO₂ replacing normal air. • Ask yourself: is CO₂ primarily hot, electrical, pressure-based, or related to breathable atmosphere?

✅ Before You Answer

• Verify what CO₂ does to the oxygen concentration in a confined space. • Consider whether portable CO₂ extinguishers are known for causing burns or electrical shock, or for affecting breathing instead. • Think about whether discharging a handheld CO₂ extinguisher normally produces enough pressure wave to damage eardrums in a small space.