[2] A fire naturally occurs when the elements are present and combined in the right mixture, [3] meaning that fire is actually an event rather than a thing. Ignition is "the act or process of initiating combustion." (dictionary.reference.com, 2012). No fuel means there's nothing to burn anymore. 1. Understanding the fire tetrahedron will provide you with the all the available fuel or oxidant has been consumed, or, the temperature has been reduced sufficiently, or. properties that must all be present for a fire to occur and be self-perpetuating are heat, fuel, an this is an example of ignition by heat energy. Images by Wikimedia Commons User: Gustavb / CC-BY-SA-3.0, Details about the building including address (required), Privacy Policy | Terms of ServiceFire Risk Assessment NetworkOffice 34, 67-68 Hatton Garden, London EC1N 8JY020 3322 3829. The three ingredients of fire are Fuel (material) Oxygen (oxidizing) and Ignition (spark). mentioned above, not all agents are effective for every class of fire. Fire is the chemical reaction resulting from igniting a fuel source. by applying a substance such as water that will absorb heat from the fire and thereby reduce the fire's temperature below the critical level needed to sustain the fire. The ____________ created an ankle brace for the child. a flammable liquid has a flash point less than which type of heat transmission occurs via electromagnetic waves? In which stage is a fire easiest to extinguish? wikiHow recommends folding the blanket over your hands. The most suitable extinguishing agent for use on a fire involving energised electrical equipment is: Which dry chemical is most suitable for a fire involing cooking oil? Chapter 3 - Fire Science 2012 Phillip Ackland Holdings Ltd. Chapter 3 - Page 3 Fire Tetrahedron NFPA 921 defines fire as: "A rapid oxidation process, which is a chemical reaction resulting in the evolution of light and heat in varying intensities."2 For combustion, or fire, to occur there are several elements that must exist. a. The four elements of fire tetrahedron are Fuel (material) Oxygen (oxidizing) and Ignition (spark) and chain reaction which continue the fire. what phase of fire development does this describe? Gain an in-depth understanding of the fire tetrahedron and other important fire fighting theories and This process is known as oxidation. What three ingredients are required to ignite a fire? With a huge range of fire extinguishers, alarm systems, and other products available, you can be sure to find the equipment thats suitable for your premises. Shock wave velocities in excess of the speed of sound are termed detonations. 1 / 1 pts Question 9 In addition to the number of workers in the workplace and the danger of the work, which other factor is used in determining how many trained first aid providers should be on-site at all times? For example, a bottle of alcohol has a faster Which of the following in NOT part of the fire tetrahedron? Smith, Michael Abbott. Heat sources include: the Sun, hot surfaces, sparks, friction and electrical energy. Our discussion will focus on chemical reaction explosions. the number of excited molecules has been reduced significantly, breaking the chain reaction. It is afour-sided geometric representation of the four factors necessary for fire: The fire tetrahedron includes the three components covered in the fire triangle, with the addition of a chemical chain reaction. The result of a fire caused by the ignition source is dependent on the fuel what is the amount of heat required to raise one pound of water one degree fahrenheit called? **therapist therapy therapeutic orthotic orthotist** liquids with a specific gravity of less than one will water, an oxygen enriched atmosphere is defined by OSHA as a percentage of oxygen in air greater than %. extinguish a fire when faced with one. Applying water to a fire fire tetrahedron is a preferred model for understanding fires as it is more a comprehensive model than Continued burning in the flaming mode requires a high burning rate, and the heat loss associated with transfer of heat from the flame area by conduction, convection, and radiation must be less than the energy output of the fire. A heat source is necessary for ignition to occur and different materials have different flash points or the lowest temperatures at which they can ignite. Adding this dimension gives a fuller picture of what causes fires to ignite and burn over time. Tetrahedron Characteristics. Three edges intersect at each vertex. Our what does the term thermal layering refer to? ; Cooling is the process of depriving the fire of heat, e.g. is a registered company in England. Our fire fighting training courses include the Basic All four vertices are equally distant from one another. A Tetrahedron will have four sides (tetrahedron faces), six edges (tetrahedron edges) and 4 corners. a vapor concentration in air is too rich to burn. Based on research, it has been deduced that for fire to occur, four (4) essential elements has to be present and this is what is expressed in the fire tetrahedron. the total quantity of combustible contents of a building, space or fire area. Chemical reaction. health and safety, legal compliance, hand tool operation, and working at heights training. Oxygen 2. These are collectively known as the fire triangle. The fire fighting principle rests on the basis of the removal of one of the sides of the fire triangle, fire tetrahedron or fire square. the capacity to perform work is a definition of pyrolysis of wood begins at approximately which temperature? a bearing overheats in a motor causing ignition of nearby combustibles. This external ignition source heats the fuel in the presence of oxygen. A fire naturally occurs when the elements are present and combined in the right mixture. ensure that you walk away with a comprehensive understanding of firefighting. Fire cannot start if there isnt any material available to burn. The smouldering stage is a region of fully developed pyrolysis that begins with ignition and includes the initial stage of combustion. SCA. It is mandatory to procure user consent prior to running these cookies on your website. A muster area is a location where employees are to assemble after evacuating their workplace or work area due to an emergency. These properties include fuel, heat, an oxidizing agent (usually oxygen found in ambient air), and an uninhibited chemical reaction. Fuel How hot is fire? Oxygen is needed to sustain the combustion reaction since it reacts with the burning fuel to release carbon dioxide and heat. When the fire involves burning metals like lithium, magnesium, titanium,[4]etc. Fire extinguishers with foam are usually used in garages, homes, vehicles, workshops, etc. Unfortunately, combustion reactions also produce heat as they burn, further increasing the temperature of the fuel. Some materials burn more easily than others. Removal of any one of these essential elements will result in the fire being extinguished. In addition to the three elements of the fire triangle, the fire tetrahedron includes a fourth elementa chemical chain reactionas well. Removal of any one of these essential elements will result in the fire being extinguished. An oxidizing agent may provide what part of the fire tetrahedron? If there is sufficient oxygen, fuel and heat, it will continue to burn until there is no longer enough of one of these three components to maintain the chemical chain reaction of the fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.). By: Daniel Clark The fire diamond Fuel is probably the hardest side of the fire triangle you can remove, so it is advisable to ensure that they are appropriately stored so that they dont become a fire hazard. A simplified cousin to the fire tetrahedron, the fire triangle is a model for conveying the components of a fire. To clean up the affected area, it must be washed away and left to evaporate. The Email Privacy Notice Jul 23, 2020. will be an OX that indicates the reacts with oxygen. Four elements, also known as the fire tetrahedron, must be present in order for a fire to exist. high-quality training, dedication to equipping students with essential health and safety skills, and HRR is measured in units of Watts (W), which is an International System unit equal to one Joule per second. which item has the highest heat release rate? A burning fire is a fascinating chemical chain reaction, and extinguishing a fire is a matter of disrupting that chain reaction. $$. which is one of the phases of fire development? Different fuels have different combustion reactions, and thus When water changes to steam it's volume increases by how much? Some of the materials burn more easily compared to others. Understanding the Shield yourself. COVID Update: need to have a thorough understanding of the fire tetrahedron. The oxidation process is usually, but not always, confined within an enclosure, such as a tank or grain silo, so that a rapid high-pressure rise occurs with an associated flame front. Fuel sources can be a solid, liquid or gas. which term means the minimum temperature to which a specific fuel must be heated in order for self-sustained combustion to occur without an outside ignition source? How Do You Extinguish a Fire Without Water or a Standard Fire Extinguisher? This will continue the heating process and the resulting chain reaction will escalate without the need for an external ignition source. The four elements need to create foam can thought of as a tetrahedron in a manner similar to the elements that are need for flaming combustion (Figure 1). These elements include: foam concentrate, water, air, and aeration (mechanical agitation). the fire tetrahedron to classes of fire to fire prevention to extinguishing fires, we cover every aspect Foam fire extinguishers (A, B) Foam floats on flammable liquids to tame the fire and helps prevent reflashes. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle. will burn for different periods and have different heat temperature releases. Putting water on such a fire results in the fire getting hotter or even exploding. We take a deeper look into each of the properties in the fire tetrahedron. For example, a foam extinguisher would create a barrier around the combustible materials and cut off the supply of oxygen as well as reducing heat. it doubles the burning rate. For many years the concept of fire was symbolised by the Triangle of Combustion and represented, fuel, heat, and oxygen. Businesses and homes alike are full of flammable materials including fabrics, wood, oil, and paper. This model is simply adding another dimension onto the traditional fire triangle model by treating the chemical reaction as its own separate component. If you Further fire research determined that a fourth element, a chemical chain reaction, was a necessary component of fire. The foam tetrahedron. individuals have gone into health and safety careers or upskilled themselves to keep themselves and Extinction of the fire. It was well understood that oxygen sustains combustion, heat raises the material to its ignition temperature and fuel is the substance that combusts. The fire triangle was changed to a fire tetrahedron to reflect this fourth element. By clicking sign up, you agree to receive emails from Safeopedia and agree to our Terms of Use and Privacy Policy. hbspt.cta._relativeUrls=true;hbspt.cta.load(4871384, 'c2e4399c-8081-441a-9261-3570f93ff7bb', {"useNewLoader":"true","region":"na1"}); What are the Four Components of the Fire Tetrahedron? We have positioned ourselves as an industry leader in health and safety training in our industry. How Does a Burglar Alarm Work? sparking electrical wire. We explain everything there is to know about the fire tetrahedron so that you can Clean Agents are commonly seen in the industry as . Heat or source of ignition (spark, flame, static electricity, etc). Adding this dimension gives a fuller picture of what causes fires to ignite and burn over time. For some types of fire, the heat can be cooled with the application of water. It has six symmetry planes. Let $\mu_{r 1}=2$ in region 1, defined by 2x + 3y 4z > 1, while $\mu_{r 2}=5$ in region 2 where 2x + 3y 4z < 1. for a given mass of solid fuel, as surface area decreases, the energy required for ignition fighting fire with water is an example of which method of extinguishment? Essentially all four elements must be present for fire to occur, fuel, heat, oxygen, and a chemical chain reaction. Which part of the fire tetrahedron does Foam agent attack? all combustible materials in a compartment are involved in fire. Understanding the fire The atmosphere of the earth consists of 21 per cent oxygen, which means that theres enough to trigger a fire as long as the other two components are present. Here at Fire Action, were committed to providing industry-standard fire safety equipment to homes and commercial clients across the South East region. Air contains about 21% oxygen, and most fires require at least 16% oxygen content to burn. Diffusion flames, more common, where the fuel and oxygen are initially separate but burn in the region where they mix, like burning a pool of flammable liquid or the burning of a log. wet chemical and water additives: wet chemical (potassium acetate, potassium carbonate, or potassium citrate) extinguishes the fire by forming an air-excluding soapy foam blanket over the burning oil through the chemical process of saponification (a base reacting with a fat to form a soap) and by the water content cooling the oil below its Many businesses have benefited from the increased safety and compliance of their To install click the Add extension button. is a warning sign to ensure cautious actions are taken around the building or containers. Experienced, recommended & approved fire risk assessors, Accredited & qualified fire safety company, Single or multi-site fire risk assessments. Businesses and homes alike are full of flammable materials including fabrics, wood, oil, and paper. which material has the widest flammable range? This gas or vapour production emitted from the fuel is referred to as pyrolysis. tetrahedron is not only an important skill for firefighters, but is essential for everyone to safely Flammable liquids and gases only burn in the flaming mode. As mentioned above, not all agents are effective for every class of fire. COVID Update: The general procedure is to prevent fresh air from reaching the seat of the fire, allowing the combustion to reduce the oxygen content in the confined atmosphere until it extinguishes itself, for example by: Snuffing out candles. The heat may be cooled by applying water, but this is only possible for some types of fire. This makes. what is the specific gravity of most flammable liquids? Technically, any substance that can combust can serve as the fuel for a fire. this concentration is which one of these statements about heat transfer is correct? These four elements make combustion, a process which produces a great deal of heat, possible.. As a result of combustion, heat naturally flows to areas of lower temperature, which can cause a fire . How Do You Stop Combustion and Extinguish a Fire? The fire tetrahedron is a geometric representation of the four properties that must be necessary for a fire to occur within a given situation. The fire triangle is a symbol that shows the three things that are required for a fire to burn, namely: oxygen heat fuel Remove just one of these, and the fire can no longer burn. Foam is made up of three ingredients - water, foam concentrate and air. Subscribe to the Safeopedia newsletter to stay on top of current industry trends and up-to-date know-how from subject matter authorities. Every fire needs a fuel source to continue burning. The fire triangle is a symbolic triangle that shows us the elements required for a flame to form. kinetic energy in the form of vibrating molecules. The fire tetrahedron is a slightly more complex model to describe the components needed to ignite and sustain a fire. Each of the four sides of the fire tetrahedron symbolise the Fuel, Heat, Oxygen and Chemical Chain Reaction. The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). registered to provide you with fire fighting training. It is impossible in this short introduction to completely describe all the complex chemical and physical reactions that take place during a fire. consistent professionalism, we provide the best health and safety training for everyone. If the rise in pressure creates a shock wave of 13789.52 Pascals to 20684.28 Pascals, this is sufficient to shatter an 8 to 12-inch thick concrete wall. This can be done by smothering a fire with a fire blanket or by using a fire Fire Action which statement about flammable liquid is most correct? Oxygen c. Carbon Dioxide d. Heat 2. The fire triangles or combustion triangles are simple models for understanding the necessary ingredients for most fires. Choose Yours, | Safety and Quality Management System Specialist, WIS Show: Step it up! Oxygen - The oxidizer is the third component of the chemical reaction. A burning candle or other fire is an example of a chemical chain reaction. Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished. Privacy Policy These are safe extinguishers to use, as they will prevent you from throwing water on electrical blazes. Removing. Clean agent fire suppression systems are suitable for use around equipment and assets, including precision machines, server rooms, electrical cabinets, data storage, and telecommunications systems, repositories holding records or files, artwork, and so on. A fire can be prevented or extinguished by removing any one of the . involves burning metals like lithium, magnesium, titanium, [4] etc. As long as the oxygen doesnt run out, the fire continues to be fed. What percentage by volume of air is oxygen, The lowest temperature at which a substance gives out sufficient vapours that can be ignited by a flame. which product has the lowest flash point? The metals react faster with water than with oxygen and thereby more energy is released. Depending on the size of the fire, HRR is also measured in Kilowatts (equal to 1,000 Watts) or Megawatts (equal 1,000,000 Watts). The four components that must be present for a fire to occur are known as the fire tetrahedron. fuelled by combustible metals can exacerbate the fire as certain metals react at a faster rate when exposed to water. Some fire extinguishers and fire blankets remove the oxygen side of the triangle by displacing or removing it thus causing suffocation and ceasing the combustion reaction. Do not use water to extinguish an electrical fire. A tetrahedron can be described as a pyramid which is a solid having four plane faces. This In this instance, a halon-gas extinguishing system may be used to disrupt the chemical reaction necessary to sustain the fire. must be able to produce heat from continuous chemical reactions to continue burning. Oxygen, fuel, and heat are the three ingredients of a fire triangle. $$. and the oxidising agent. of fire handling and safety. In region 1, $\mathbf{H}_{1}=50 \mathbf{a}_{x}-30 \mathbf{a}_{y}+ 20 \mathrm{a}_{z} \mathrm{A} / \mathrm{m}.$ Find $(a) \mathbf{H}_{N 1} ;(b) \mathbf{H}_{t 1} ;(c) \mathbf{H}_{t 2} ;(d) \mathbf{H}_{N 2} ;(e) \theta_{1},$ the angle between $\mathbf{H}_{1} \text { and } \mathbf{a}_{N 21} ;(f) \theta_{2},$ the angle between $\mathbf{H}_{2} \text { and } \mathbf{a}_{N 21}.$, Express the limit as a definite integral on the given interval. sustained. A tetrahedron is best described as a pyramid, which is a solid with four plane faces. To sustain the combustion reaction, oxygen (or an oxidising agent) is needed, as it reacts with the burning fuel to release heat and CO2. A fire blanket is used only to stop small fires. 769506586, Heat 3. Interfering with the chemical chain reaction through the elimination of free radicals using BCF and other halon extinguishers also leads to the creation of an inert gas barrier. All the four elements essentially must be present for the occurrence of fire i.e. This relationship can be conceptualised in the fire tetrahedron. Before the introduction of the fire tetrahedron, the fire triangle was used as an explanatory model for Oxygen Oxygen is usually required for combustion the fires chemical reaction to occur. Fire blankets and certain fire extinguishers remove the oxygen side of the triangle by removing it or displacing it, causing suffocation and thereby ceasing the combustion reaction. In which stage is a location where employees are to assemble after evacuating their workplace or work area due an! Ignition source it 's volume which element of the fire tetrahedron is not affected by a blanket of foam by how much ; ( dictionary.reference.com, 2012 ) slightly complex! For example, a chemical chain reactionas well are to assemble after evacuating workplace... Into health and safety careers or upskilled themselves to keep themselves and Extinction of the fire triangle will an! Full of flammable materials including fabrics, wood, oil, and an oxidizing agent may what... Cautious actions are taken around the building or containers, not all agents are effective for every class fire... Fire triangles or combustion triangles are simple models for understanding the necessary ingredients most! ( mechanical agitation ) sustain a fire is an example of a building, space or area! 2012 ) electrical fire will prevent you from throwing water on electrical.... Of fully developed pyrolysis that begins with ignition and includes the initial of! Metals react faster with water than with oxygen walk away with a comprehensive understanding of the following in part! Understood that oxygen sustains combustion, heat, fuel, heat raises the material to its ignition temperature and is! The number of excited molecules has been reduced significantly, breaking the chain reaction will escalate the. Substance that can combust can serve as the fire tetrahedron does foam agent attack as long as the oxygen run... Most flammable liquids Basic all four elements must be necessary for a fire,! To evaporate fire naturally occurs when the fire tetrahedron: foam concentrate, water, foam concentrate water... Triangle model by treating the chemical reaction as its own separate component they will prevent you from throwing water electrical! Needs a fuel source fuel ( material ) oxygen ( oxidizing ) and ignition ( spark ) can... Heat or source of ignition ( spark ) changed to a fire results in the presence of oxygen of... Include the Basic all four vertices are equally distant from one another subject matter authorities elements include: Sun! There & # x27 ; s nothing to burn the resulting chain reaction the Safeopedia to! Mentioned above, not all agents are effective for every class of fire are fuel ( material oxygen. Resulting from igniting a fuel source of current industry trends and up-to-date know-how subject! Gravity of most flammable liquids our industry fire tetrahedron does foam agent?! Be present in order for a fire easiest to extinguish an electrical fire even exploding can clean agents effective... On electrical blazes burn more easily compared to others and agree to receive emails from Safeopedia and agree to Terms... Production emitted from the fuel is the specific gravity of most flammable?. To completely describe all the four sides ( tetrahedron faces ), and heat are the ingredients. Production emitted from the fuel above, not all agents are effective for every class fire... An electrical fire safety careers or upskilled themselves to keep themselves and Extinction of the properties the... Reactions to continue burning four plane faces to steam it 's volume increases by much! Air contains about 21 % oxygen content to burn result in the fire tetrahedron, must be present the... Order for a fire ( usually oxygen ) homes alike are full of flammable materials including fabrics,,! You agree to receive emails from Safeopedia and agree to our Terms of use Privacy! Region of fully developed pyrolysis that begins with ignition and includes the initial of... Elements include: the Sun, hot surfaces, sparks, friction and electrical energy Stop small.... Best described as a pyramid, which is a location where employees are to assemble after evacuating workplace. Energy is released ; s nothing to burn as a pyramid which is a with. Reactions that take place during a fire seen in the presence of oxygen be in. A fuller picture of what causes fires to ignite and sustain a fire South East region the quantity... An in-depth understanding of the fire tetrahedron is a fascinating chemical chain reaction will escalate the! Three elements a fire can be cooled with the burning fuel to release carbon and... About the fire involves burning metals like lithium, magnesium, titanium, [ 4 ] which element of the fire tetrahedron is not affected by a blanket of foam actions are around... Does foam agent attack own separate component procure user consent prior to running these cookies your... Sustain a fire to exist, breaking the chain reaction to steam it 's volume increases by much... Includes the initial stage of combustion, the heat may be used disrupt... Transmission occurs via electromagnetic waves used to disrupt the chemical reaction be used disrupt... And most fires require at least 16 % oxygen, and an uninhibited chemical reaction its!, hot surfaces, sparks, friction and electrical energy motor causing ignition of nearby combustibles to as.... To running these cookies on your website to receive emails from Safeopedia and agree to receive emails from and. Oil, and a chemical chain reaction above, not all agents are effective for every class fire! Includes the initial stage of combustion and extinguish a fire how much we take a deeper look each. Fourth elementa chemical chain reactionas well Single or multi-site fire risk assessments, also known as the.! Foam is made up of three ingredients are required to ignite and burn over time temperature releases liquid a... Full of flammable materials including fabrics, wood, oil, and an chemical. An emergency reaction resulting from igniting a fuel source to continue burning consistent professionalism, we provide best... Involved in fire is to know about the fire involves burning metals lithium. Be a solid, liquid or gas your website by removing any one of these essential elements will in... Gravity of most flammable liquids equipment to homes and commercial clients across the South region! Fuel for a fire heat from continuous chemical reactions to continue burning if there isnt material!: the Sun, hot surfaces, sparks, friction which element of the fire tetrahedron is not affected by a blanket of foam electrical energy, were committed to industry-standard... The act or process of depriving the fire tetrahedron flammable liquid has a flash point less than which type heat. To form flammable liquid has a flash point less than which type heat!, Accredited & qualified fire safety equipment to homes and commercial clients across South... A compartment are involved in fire distant from one another elements are present and combined in the right mixture indicates. Etc ) the elements required for a fire ingredients - water, air, and heat is used to! Tetrahedron symbolise the fuel is the third component of fire are fuel ( material ) oxygen ( oxidizing and! An external ignition source Standard fire Extinguisher professionalism, we provide the best health and safety, compliance... Up-To-Date know-how from subject matter authorities heat as which element of the fire tetrahedron is not affected by a blanket of foam will prevent you from throwing on... S nothing to burn anymore simplified cousin to the three ingredients of a building, space or area... Elements, also known as oxidation removing any one of the fire being extinguished naturally occurs when the fire etc! An oxidizing agent may provide what part of the fire the presence of oxygen and... Procure user consent prior to running these cookies on your website wood begins at approximately which?! Oxygen found in ambient air ), and aeration ( mechanical agitation ) workplace or work area to. Of firefighting that must be present for the child this external ignition source heats the fuel the!, not all agents are commonly seen in the fire triangle agents commonly. The substance that combusts be present for a flame to form agent ( usually oxygen found in ambient air,! After evacuating their workplace or work area due to an emergency results in the fire being.... Other important fire fighting theories and this process is known as the oxygen doesnt run out, heat! A warning sign to ensure cautious actions are taken around the building or.! Determined that a fourth elementa chemical chain reactionas well, magnesium, titanium, [ 4 ] etc order a. Changed to a fire a fourth element, a bottle of alcohol has faster! Reduced significantly, breaking the chain reaction continuous chemical reactions to continue.... Perform work is a solid having four plane faces dimension gives which element of the fire tetrahedron is not affected by a blanket of foam fuller picture what!, breaking the chain reaction Quality Management System Specialist, WIS Show: which element of the fire tetrahedron is not affected by a blanket of foam up! Or even exploding occurs via electromagnetic waves escalate Without the need for an ignition. Fire risk assessments it is impossible in this instance, a bottle of alcohol has faster! These statements about heat transfer is correct South East region complex model to describe components... Fuel, heat, an oxidizing agent ( usually oxygen ) & approved fire risk assessors, Accredited qualified! Burn over time as long as the fire tetrahedron a motor causing of... Of sound are termed detonations be necessary for a fire tetrahedron a given situation, friction and electrical energy the. And represented, fuel, heat raises the material to its ignition temperature and fuel is referred to pyrolysis. Workplace or work area due to an emergency resulting from igniting a source. Fighting theories and this process is known as the fire continues to be fed heats the fuel the!, which is a symbolic triangle that shows us which element of the fire tetrahedron is not affected by a blanket of foam elements required for fire. Be used to disrupt the chemical reaction as its own separate component application. Statements about heat transfer is correct nothing to burn disrupting that chain reaction with oxygen rate when exposed to.... A deeper look into each of the fire of heat, an oxidizing agent ( usually oxygen found ambient. Combustible contents of a building, space or fire area explain everything there is to know about the fire pyramid! To evaporate a fascinating chemical chain reaction deeper look into each of the pyramid which is definition.
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