Low velocity fog extinguishes a fire by...

Question 1 of 270705eccef9ebacbc34ba4d4625e

Low velocity fog extinguishes a fire by __________.

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Question 1 of 27070

Q

Low velocity fog extinguishes a fire by __________.

🔍 Key Concepts

• mechanism of action of low velocity water fog on burning fuel surfaces • difference between cooling, smothering (oxygen displacement), and washing out (mechanical removal of vapors) • how fine water droplets interact with flammable vapors and heat

💭 Think About

• Ask yourself: What does a very fine water mist actually do when it hits a hot fire area and the surrounding vapors? Think about heat absorption, steam formation, and vapor behavior. • Consider whether low velocity fog mainly removes oxygen, removes heat, or physically knocks vapors out of the air—or some combination of these. • Which pair of effects best matches what happens when you spray a gentle fog over a pool fire or fuel spill fire on deck?

✅ Before You Answer

• Verify how water fog droplets absorb heat and turn to steam—does that describe cooling? • Think about whether fog forms a tight enough blanket over the surface to be considered strong smothering, or if its key action is something else. • Consider if the fog can mechanically drive fuel vapors away from the flame area (i.e., "wash out" vapors) and whether that is a recognized effect in firefighting doctrine.