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A triangle labelled heat, fuel and oxygen.
Also known as: Combustion triangle, Fire tetrahedron, Triangle with three words, Heat fuel oxygen triangle
The fire triangle shows the three things a fire needs, and it is a working tool rather than a diagram: removing any one side extinguishes the fire, which is what every extinguishing method does. The tetrahedron adds a fourth face for the chain reaction.
Denotes the three elements required for combustion — heat, fuel and an oxidising agent — arranged on the sides of a triangle.
Contexts: Public information
Functions as a method rather than an illustration: every extinguishing technique removes one of the three sides, which is how the diagram is used in training.
Contexts: Public information
Is extended to a fire tetrahedron with a fourth face for the sustaining chain reaction, which is what chemical extinguishing agents interrupt.
Contexts: Public information
An equilateral triangle with one word written along each of its three sides, sometimes with a flame drawn at its centre.