Fires come in many different temperatures and colors depending on many different things that may affect the fire. There are also many types of materials that can fuel fires and make them burn in different ways. All of the materials I will use in my experiment are very commonly found in the average household. Fire can come in very different unique forms depending on the conditions. Fires have are able to burn gases, liquids, and solids. Fires are useful for lighting rooms with light bulbs, torches, and candles. Also fires can be used for heating.
Most of the time fires are useful and used in everyday life but people just don’t notice. But, there are also fires that can be harmful and destroy many things. There are many industries today that use fires to make other things. For example fire is use to burn oil, coal, and natural gas to make electricity. With advances in fuel people can make fires burn for many different purpose. The cost of material to use as fuel for a fire varies because you can use almost anything but, some are better than others. For example in the right condition things like metal will burn but, it is much easier to burn things such as gasoline which is easily combustible and easily sustains flames as long as there is enough for the fire to burn.
In the first paragraph it will talk about the materials that can be used for a fire. In the second paragraph it will talk about the spread of fires outside and some of the dangers fires. In the third paragraph it will talk about some of the variables like wind and how it can affect fire in different ways. In the fourth paragraph it will talk about airflow, and how different surfaces in enclosed areas and in open areas affect the flames. In the fifth paragraph it will talk about how fires act in enclosed areas. In my tests I will show what kind of household oil will burn the longest. Fire can take many different forms all of them involve chemical reactions between combustible materials and oxygen from the air. Fire can have an effect on many thing, it can cause damage and human suffering.
Most fires involve many different types of combustible materials that are usually solids but, there are some gaseous and liquid fuels like oil or natural gas. The range of fuels with which this experiment is concerned is very wide from gaseous hydrocarbons to solid of high molecular weight and great chemical complexity, some of which occur naturally, like cellulose and man made polyethylene and polyurethane. Anything will burn under the certain conditions reacting with oxygen from the air surrounding the the material. The product of the combustion is heat and the release of different gases. Combustive solids alcomt invisibilly involves thermal decomposition or pyrolysis of polymer molecules at temperatures at the surface.
This is produced by melting depending on the substance. At high temperatures a small number of addition polymers polymethylmethacrylate known by then acronym PMMA will undergo a reverse of polymerization process known as unzipping of end- chain scission to give high yields of monomer in decomposition of products.Fire intensity will directly influence scorch height therefore determine how much the fire burns. The rate at which the fire spreads is the determinant on residence time. Fire fuels will burn more intensely and spread more quickly as well as more likely to ignite in the first place. Fuel load determines the maximum energy available to a fire. Arrangement of fuel can affect aeration vertical spread and horizontal spread.
Size distribution of fuel can affect the likelihood of initial ignition. Chemistry of fuel can increase flammability(resins oils) or decrease is (mineral contectr). Wind causes fuels to dry and it increase the availability of oxygen . The more available oxygen the easier it is for the materials to burn.
Preheats and ignition fuel in advance of the front can produce ignition far ahead of the front. They also can change the front size and the direction the front this traveling in. The success of burning as a hazard-reduction technique depends upon a realistic assessment of the proportion of total fuel which will become available in serious fire conditions and the ability of materials to burn frequently enough to maintain the levels of available fuel below the threshold.The heat required for ignition depends on ignition temperatures moisture content of fuel and the amount of fuel involved in the ignition process. The amount of fuel involved in the ignition process is the effective bulk density. The effective heating number is defined as the ratio of the effective bulk density to the actual bulk density .
The energy released rate of the fire front is produced by burning gases released from the organic matter in the fuels. Therefore the rate of change of this organic matter from a solid to a gas is a good approximation of the subsequent heat released rate of the fire. The heat release rate per a unit of area of the front is called the reaction intensity. Wind and slope changes the propagation net flux by exposing the potential fuel to additional convection and radiant heat. The heat of the preignition and the effective bulk density are the two terms that head to be evaluated before the prerogatives flux could be computed. Slow and fast burning fires that reached loss kw in six hundreds and one-hundred fifty respectively spread in a certain way. The predicted flame spread rate was within 0.
3 m/s from any point in time during the analysis. The comparison at quasi-steady burning rate when one of the full slab was burning shows over estimated amount of flame spread radiation burning rate. An extensive amount of flame spread variation was done and there is differen ways flames can spread in enclosure opposed to outside and on flat surfaces. When there is flames it makes soot and the soot can attach on surfaces. And in certain times if the condition are right the soot has the ability to combust. Flames have a variety of heat fluxes and it can affect the way materials burn in the flames. The smoke produced from the the fire and the airflow around the flames can have an effect on the way the fire burns.
If there is no more oxygen left in an enclosed area is filled with smoke the flames will start to die down from the lack of oxygen need for the materials to burn and eventually go out completely. When airflow is good the the airflow can cause the fire front to spread rapidly and different from being in normal airflow. Fire is a physical and chemical phenomenon that is astonishing nonlinear andquantitative that the process that is involved is often complex. Fires mainly involves mass fluxes and heat fluxes to and from the fuel and the surroundings. After ignition the fire grows and produces increasing amounts of energy mostly due to flame spread in the early stages.
Also in the early stages of the fire the enclosure the fire is in has little to no effect on how the fire burns and spreads. Fire can be developed in a multitude of different ways mostly depending on the enclosure geometry and the ventilation of the enclosed area and the type of fuel in the enclosed area and the surface area of the fuel in the enclosed area. Other than releasing energy in the form of heat and light a variety of toxic and non- toxic gases and solids are produced in a fire. The generation of energy and combustion of materials is a very complex issue as there are many factors the plume the hot gases in the flame that are surrounded by cold gases and the hotter less dense mass will raise upward due to the density difference or the buoyancy of the of the cold substances versus the hotter substances that have been in the fire.
The gases around the flame in an enclosed area can be categorized as cold and hot layers.In conclusion fire is very useful and can be used in everyday life, so finding a material that is easily accessible and burns for an extended period of time may be helpful. Fire has many different uses as it can be used for cooking or used as heating, or used as lighting. Fire is easily made because of the variety of materials you can use for fuel for the fire such as liquids, solids, and gases. Fire can also can easily be sustained by adding more fuel and giving it access to oxygen. Also an important thing to remember is if there is no more oxygen left in the area where the fire is the area will be filled with smoke then flames will start to die down from the lack of oxygen need for the materials used for fuel to burn and eventually go out completely.
Another important thing is fire is not all good fire can cause much human suffering by destroying things. Also fire is very complex and every fire is different even when burning the same materials. In the early stages of a fire they are usually pretty similar but as time goes on depending on the material the fire is burning the flames can have a large range of temperatures and colors. Fires release energy in the form of heat and light which can be converted into different forms of energy to power things such as cars. In areas where the fire is enclosed like inside your house the fire burns the same as if it were in an open area.
Another important point is that fires depending on the materials used for fuel and release different gases some toxic and some non – toxic. And the edge of a fire is called the front and can spread at different speeds depending on the conditions. When fire burns it also releases soot and it will stick onto things surrounding the fire for example if you have a fire place and you burn a fire in it the fire will release soot and the soot will stick to the chimney and in certain condition the soot can burn this is why some people’s houses light on fire.
Because, people burn a lot of fire in there fire place and they do not clean the chimney so in consequence the soot in the right conditions combust then the flame shooting out the chimney lights the roof on fire and your house burns down. Fires are both useful and harmful and be in a multitude of different situations.