Safety, Fire & Survival · Fire — Triangle/Tetrahedron
The fire tetrahedron adds which element to the three sides of the classic fire triangle (heat, fuel, oxygen)?
- ASmoke
- BLight
- CPressure
- DThe uninhibited chemical chain reaction✓ Correct
Explanation
The fire triangle is heat, fuel, and oxygen; the tetrahedron adds the self-sustaining chemical chain reaction. Removing any one element extinguishes the fire — dry chemical and clean agents work by interrupting the chain reaction.
Authority: NFPA; fire theory
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