The rekindling of a fire can occur when a fire, extinguished by smothering, is resupplied with oxygen. Which of the fire extinguishing agents listed, when properly used on an oil fire, will prevent rekindling?
• Classes of fire and which agents are best for flammable liquids (oil) • How smothering and cooling stop combustion and prevent rekindling • Differences in how fog, foam, and dry chemical act on a liquid fuel surface
• Ask which agent forms a stable barrier between the fuel surface and the air, instead of just blowing the flames away or temporarily interrupting the flame • Consider which agent is designed specifically for flammable liquid (oil) fires on decks or in tanks, especially where a liquid surface must be covered • Think about long-term effect: which choice is most likely to seal the surface and prevent oxygen from getting back to the fuel
• Identify which option is classified/used as a primary agent for flammable liquid (Class B) fires, especially on ships • Check which agent can blanket and seal the fuel surface, not just cool it or knock down flames • Verify which agents (fog and dry chemical) might allow vapors to escape once application stops, increasing risk of rekindling
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