🔍 Key Concepts

• Properties of carbon dioxide (CO₂) extinguishers – how they put out a fire (displacing oxygen, no cooling effect) • Difference between closed/contained spaces vs. open areas when using CO₂ • Types of fires where special agents are required (e.g., combustible metals like magnesium)

💭 Think About

• Ask yourself: Does CO₂ mainly work by cooling the fire, or by removing something the fire needs to keep burning? • Think about whether CO₂ gas will stay around the fire or blow away quickly in open air. • Consider which fire type in the choices would actually be dangerous or ineffective to fight with a standard CO₂ extinguisher.

✅ Before You Answer

• Verify how CO₂ affects the oxygen supply to the fire. • Check whether CO₂ provides significant cooling compared to water or foam. • Confirm what kind of extinguishing agents are typically used for metal fires (Class D) like magnesium.