Dry Chemical extinguishers work on Class A, B, or C; their method is to:

Dry Chemical extinguishers work on Class A, B, or C; their method is to:

• A. Smother by removing air
• B. Control air by smothering
• C. React chemically to extinguish
• D. Dilute the air

Answer: (B)

Dry chemical extinguishers extinguish by smothering the flame and limiting the air that can reach it, while also depositing powder that interferes with the chemical reactions happening in the flame front. When discharged, the powder blankets the fire and forms a barrier between the fuel and the surrounding air, reducing oxygen contact and disrupting the flame chemistry that propagates burning. This makes the method effective on ordinary combustibles, flammable liquids, and energized electrical fires. It’s not primarily about cooling, diluting the air, or reacting with the fuel itself, but about blocking air access and interrupting the flame reactions.

Dry chemical extinguishers extinguish by smothering the flame and limiting the air that can reach it, while also depositing powder that interferes with the chemical reactions happening in the flame front. When discharged, the powder blankets the fire and forms a barrier between the fuel and the surrounding air, reducing oxygen contact and disrupting the flame chemistry that propagates burning. This makes the method effective on ordinary combustibles, flammable liquids, and energized electrical fires. It’s not primarily about cooling, diluting the air, or reacting with the fuel itself, but about blocking air access and interrupting the flame reactions.