Often thought of as a flammable substance, fire is a chemical reaction that releases energy in the form of heat. This heat is used to maintain and expand the fire. Fire has been used for many purposes by humans including cooking, signaling, and incineration of waste. Fire is also used in modern applications such as internal combustion vehicles.
Fire is a chemical reaction that occurs when oxygen in the air reacts with combustible material. This reaction produces heat, which in turn ignites the combustible material. The reaction is exothermic, meaning that it produces energy more than it consumes. Incomplete combustion produces soot, while complete combustion produces gaseous fuel and water.
Fuel is any type of combustible material. These fuels can be gases, liquids, or solids. The size, shape, and moisture content of the fuel determine the amount of energy released when the fuel is burned. Fuels are also characterized by the temperature at which they are ignited, known as the ignition temperature. Fuels are usually a mixture of combustible materials and oxygen. The moisture content of the fuel determines how easy it is to burn.
The first step in a fire is to create a fuel-air mixture that combines to form a mixture of gases. Incomplete combustion produces soot and other products, while complete combustion produces only gaseous fuel and water. The dominant color of the flame changes with temperature, and the color is based on the chemical makeup of the emission spectra. Most flames contain nitrogen and carbon dioxide.
The chemical reaction that produces the flame is an exothermic reaction, meaning that it is self-perpetuating. This is due to the high amount of energy released during the reaction, as well as the heat energy that is released as a result of the reaction. It’s also the simplest chemical reaction that happens in fire.
The reaction produces an incandescent solid particle, which produces the familiar orange glow of “fire”. It also produces black-body radiation, which is emitted from the soot particles. However, the gas particles in combustion are too small to behave like perfect blackbodies.
The flame is a mixture of gases and solids. The heat of the flame keeps the fuel at the ignition temperature, which in turn allows it to burn as long as it has oxygen in the air. The reaction is self-perpetuating, but it may be slow, depending on the fuel. It can be prevented by properly setting the fuel aflame, using fire extinguishers, or by adding a retardant chemical to the mix.
The reaction also produces an incandescent solid particle, known as a “flame.” It is a mixture of gases and solids. It is the most obvious of all the fire-related things. It also produces visible light, ultraviolet light, and infrared light. The flame is an indication of the spectroscopy of stars, but it is not the only visible object.
The TED-Ed lesson on combustion explains the chemical reaction that produces a flame. It also explains the spectroscopy of stars, which explains the chemical makeup of the emission spectra of stars.