Safety, Fire & Survival · Firefighting
Foam is especially effective on a Class B (flammable liquid) fire because it:
- AConducts electricity away from the fire
- BCools the metal structure only
- CForms a blanket that separates the fuel from oxygen and suppresses vapors✓ Correct
- DAdds oxygen to complete combustion
Explanation
Foam floats on the liquid surface, smothering the fire by sealing the fuel away from oxygen and suppressing flammable vapors, while its water content cools. It is the agent of choice for spill and tank fires but must not be used on live electrical equipment.
Authority: STCW A-VI/1 Basic Training (foam)
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