Fire is a chemical reaction that requires three elements to be present for the reaction to take place and continue. The three elements are: Heat, or an ignition source Fuel, &  Oxygen. These three elements typically are referred to as the “fire triangle.” Fire is the result of the reaction between the fuel and oxygen in the air. Scientists developed the concept of a fire triangle to aid in understanding of the cause of fires and how they can be prevented and extinguished. Heat, fuel and oxygen must combine in a precise way for a fire to start and continue to burn. If one element of the fire triangle is not present or removed, fire will not start or, if already burning,will extinguish.