When dry chemical extinguishers are used to...

Question 1 / 2707066636eec28f7522a1c51c218

Question 1 of 2707066636eec28f7522a1c51c218

When dry chemical extinguishers are used to put out class B fires, why is there a danger of reflash?

Question 1 of 27070

When dry chemical extinguishers are used to put out class B fires, why is there a danger of reflash?

🔍 Key Concepts

• Class B fires involve flammable liquids and gases, not ordinary combustibles • How dry chemical extinguishing agents actually stop the burning process • The difference between smothering a fire and cooling a fire

💭 Think About

• Ask yourself: What keeps a flammable liquid from reigniting once the flame is knocked down? • Which property of a fire triangle (heat, fuel, oxygen) does a dry chemical mainly affect? • If the fuel surface is still hot after discharge, what does that mean for the chance of reflash?

✅ Before You Answer

• Verify which option mentions cooling and think about whether dry chemical significantly lowers fuel temperature • Consider whether dry chemical stays on the surface long enough to prevent reignition or if it can dissipate or be disturbed • Eliminate any choice that claims dry chemical is not effective on Class B fires, based on what you know about standard fire extinguishers

Question 1 of 27070

When dry chemical extinguishers are used to put out class B fires, why is there a danger of reflash?

Dry chemical dissipates quickly

Dry chemical is not an effective agent on Class B fires

Dry chemical agents do little or no cooling

It is rapidly absorbed by the liquid

Question 1 / 2707066636eec28f7522a1c51c218

Question 1 of 2707066636eec28f7522a1c51c218

When dry chemical extinguishers are used to put out class B fires, why is there a danger of reflash?

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Question 1 of 27070

When dry chemical extinguishers are used to put out class B fires, why is there a danger of reflash?