Further fire research determined that a fourth element, a chemical chain reaction, was a necessary component of fire. chain reaction. A tetrahedron can be described as a pyramid which is a solid having four plane faces. Briefly describe the stages of fire from the ignition phase through decay. The fire triangle was changed to a fire tetrahedron (pyramid) … Discuss heat, fuel, oxygen, and a chemical chain reaction (fire tetrahedron) and how it produces flaming (visible fire). It includes the three components covered in the fire triangle, with the addition of a chemical chain reaction. It is often referred to as the "fire tetrahedron'. The concept of fire was symbolized by the Triangle of Combustion and repres­ented, fuel, heat, and oxygen. Fire extinguishment is done by eliminating one of the variables of the fire tetrahedron. Fire needs three things to burn (actually 4, but we will talk about that in a minute). This phenomenon is well known to hay farmers. Three elements must be present for for the fire to occur: heat, oxygen, fuel, and the chemical chain reaction. 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. However, it does not explain the nature of the fire. Only gases burn. The fire triangle is a simple means of illustrating the three requirements for the existence of fire. Removal of any one of these essential elements will result in the fire being extinguished. By removing the fuel, oxygen, or heat, or inhibiting the chemical chain reactions, a fire can be extinguished. Eventually, fire triangle has been updated to fire tetrahedron on addition of fourth element to the fire triangle i.e. The fire tetrahedron is a slightly more complex model to describe the components needed to ignite and sustain a fire. Difference Between the Fire Triangle and Fire Tetrahedron. (the fourth is a chemical chain reaction and makes up the fourth side of the more advanced fire tetrahedron). Oxygen is in abundant supply for wildland fires. In particular, it does not include the chain reaction that results from chemical reactions among the fuel, oxygen, and heat. These three things are oxygen, heat, and fuel. The fuels can exist in three types of matter: solid, liquid, and gas. 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. The fire triangle was changed to a fire tetrahedron to reflect this fourth element. 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). The fire triangle was changed to a fire … For a fire to take place, these four aspects must be brought together. Summarize the benefits of fire protection systems in different types of structures based on fire behavior. This chemical reaction must produce sufficient exothermic energy to commence ignition. These make up the three sides of the fire triangle. Essentially all four elements must be present for fire to occur, fuel, heat, oxygen, and a chemical chain reaction. 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