Discussion
Which of the following is an element of fire tetrahedron which is not present in fire triangle ?
Answer: D
The element added in the fire tetrahedron is the uninhibited chain reaction.
The fire triangle says a fire needs fuel, heat and oxygen. The fire tetrahedron adds a fourth element: the self-sustaining chemical chain reaction of free radicals in the flame. This explains why some extinguishing agents, such as dry chemical powders and halons, work by breaking the chain rather than by cooling or smothering.
Fuel, heat and oxygen are the three sides of the original triangle, so they are present in both models.
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