Safety, Fire & Survival · Fire Theory
The three elements that must be present for a fire to burn (the fire triangle) are:
- AFuel, heat, and oxygen✓ Correct
- BFuel, smoke, and water
- CHeat, light, and carbon dioxide
- DOxygen, nitrogen, and fuel
Explanation
A fire needs fuel, heat, and oxygen in a sustained chemical chain reaction. Remove any one — cool it (heat), smother it (oxygen), or remove the fuel — and the fire goes out. This is the basis of every firefighting method.
Authority: STCW A-VI/1 Basic Training (fire prevention)
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