Safety, Fire & Survival · Fire — Foam
Firefighting foam is especially effective on a flammable-liquid (Class B) fire because it:
- AForms a blanket that excludes air and suppresses flammable vapor✓ Correct
- BConducts electricity
- CReacts explosively with fuel
- DCools only the surrounding steel
Explanation
Foam floats on the liquid, blanketing the surface to cut off oxygen and seal in vapors, while its water content cools. It is unsuitable for energized electrical (Class C) and metal (Class D) fires.
Authority: NFPA 11; fire theory
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