🔍 Key Concepts

• How dry chemical agents extinguish fires (smothering and interrupting the chemical reaction) • Difference between cooling, smothering, and chemical inhibition as methods of extinguishing fire • Typical properties and limitations of dry chemical vs foam and CO₂ extinguishers

💭 Think About

• Which method does a dry chemical primarily use to put out a fire: cooling the fuel, removing oxygen, or interrupting the chemical chain reaction? • Does a dry chemical agent usually guarantee that a fire can’t re-ignite if the heat source and fuel are still present? • Which fire extinguisher type is known mainly for cooling (lowering temperature), and which for displacing oxygen or interrupting the reaction?

✅ Before You Answer

• Verify whether dry chemical agents are known for strong cooling effect or for smothering/chemical inhibition instead • Check if any fire-fighting agent can truly guarantee permanent extinguishment regardless of reignition sources • Compare the option list with what is actually true of dry chemical agents, then ask if “all of the above” can be correct if even one statement is inaccurate