What are the four sides of the Fire Tetrahedron?

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Multiple Choice

What are the four sides of the Fire Tetrahedron?

Explanation:
Fire needs four things to keep burning: oxygen, fuel, heat, and a chemical chain reaction that continues the flame. The last element isn’t a material you add, but the ongoing radical reactions (like H, O, and OH) that propagate combustion. If that chain reaction is inhibited—by cooling, dilution, or radical scavengers—the flame cannot sustain itself, even if oxygen, fuel, and heat are present. That’s why the correct description includes an uninhibited chemical chain reaction. Water, while it can cool or smother a fire, is not a component of what sustains combustion. A spark supplies heat to start a fire but isn’t a permanent sustaining factor.

Fire needs four things to keep burning: oxygen, fuel, heat, and a chemical chain reaction that continues the flame. The last element isn’t a material you add, but the ongoing radical reactions (like H, O, and OH) that propagate combustion. If that chain reaction is inhibited—by cooling, dilution, or radical scavengers—the flame cannot sustain itself, even if oxygen, fuel, and heat are present. That’s why the correct description includes an uninhibited chemical chain reaction.

Water, while it can cool or smother a fire, is not a component of what sustains combustion. A spark supplies heat to start a fire but isn’t a permanent sustaining factor.

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