Three elements must be present for for the fire to occur: heat, oxygen, fuel, and the chemical chain reaction. The fire triangle was changed to a fire tetrahedron (pyramid) … In particular, it does not include the chain reaction that results from chemical reactions among the fuel, oxygen, and heat. These make up the three sides of the fire triangle. This phenomenon is well known to hay farmers. Discuss heat, fuel, oxygen, and a chemical chain reaction (fire tetrahedron) and how it produces flaming (visible fire). The concept of fire was symbolized by the Triangle of Combustion and represented, fuel, heat, and oxygen. It includes the three components covered in the fire triangle, with the addition of a chemical chain reaction. the fire tetrahedron is a four-sided geometric representation of the four factors necessary for fire: fuel (any substance that can undergo combustion), heat (heat energy sufficient to release vapor from the fuel and cause ignition), oxidizing agent (air containing oxygen), and uninhibited chemical chain reaction (sufficient exothermic reaction energy to produce ignition). Further fire research determined that a fourth element, a chemical chain reaction, was a necessary component of fire. The fire triangle is a simple means of illustrating the three requirements for the existence of fire. This chemical reaction must produce sufficient exothermic energy to commence ignition. The only difference is that the uninterrupted chemical chain reaction between the combustible, oxidizer, and thermal energy is represented as a distinct component, whereas it simply is implied in the overall construction of the fire triangle. The fire triangle was changed to a fire … The fire triangle was changed to a fire tetrahedron to reflect this fourth element. Summarize the benefits of fire protection systems in different types of structures based on fire behavior. Further research discovered that a fourth element is required to sustain a fire – an uninhibited chemical chain reaction. Briefly describe the stages of fire from the ignition phase through decay. However, it does not explain the nature of the fire. The uninhibited chemical chain reaction portion of the tetrahedron is a complex set of chemical reactions that result in the rapid oxidation of a fuel, producing heat, light, and a variety of chemical by-products. By removing the fuel, oxygen, or heat, or inhibiting the chemical chain reactions, a fire can be extinguished. Fire needs three things to burn (actually 4, but we will talk about that in a minute). Only gases burn. These three things are oxygen, heat, and fuel. (the fourth is a chemical chain reaction and makes up the fourth side of the more advanced fire tetrahedron). It is often referred to as the "fire tetrahedron'. Eventually, fire triangle has been updated to fire tetrahedron on addition of fourth element to the fire triangle i.e. Difference Between the Fire Triangle and Fire Tetrahedron. A tetrahedron can be described as a pyramid which is a solid having four plane faces. Removal of any one of these essential elements will result in the fire being extinguished. Essentially all four elements must be present for fire to occur, fuel, heat, oxygen, and a chemical chain reaction. 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