fire triangle

fire +‎ triangle From the three elements necessary to sustain a fire, therefore being a metaphorical "triangle" (though more like a tripod, having three supporting elements sustaining the fire)

fire triangle (countable and uncountable, plural fire triangles)

1. The three elements necessary and sufficient to sustain a fire; being fuel (ie. wood or petrol/gasoline), oxidizer (ie. oxygen), and sufficient heat (ie. reaction temperature or activation energy).
2. The diagram representing the three elements of a fire.
3. A fire and its three components.

• combustion triangle