Combustion/kəmˈbʌs.tʃən/ or burning is a high-temperature exothermicredox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. Combustion in a fire produces a flame, and the heat produced can make combustion self-sustaining. Combustion is often a complicated sequence of elementaryradical reactions. Solid fuels, such as wood, first undergo endothermicpyrolysis to produce gaseous fuels whose combustion then supplies the heat required to produce more of them. Combustion is often hot enough that light in the form of either glowing or a flame is produced. A simple example can be seen in the combustion of hydrogen and oxygen into water vapor, a reaction commonly used to fuel rocket engines. This reaction releases 242kJ/mol of heat and reduces the enthalpy accordingly (at constant temperature and pressure):
Combustion of an organic fuel in air is always exothermic because the double bond in O2 is much weaker than other double bonds or pairs of single bonds, and therefore the formation of the stronger bonds in the combustion products CO2 and H2O results in the release of energy. The bond energies in the fuel play only a minor role, since they are similar to those in the combustion products; e.g., the sum of the bond energies of CH4 is nearly the same as that of CO2. The heat of combustion is approximately -418 kJ per mole of O2 used up in the combustion reaction, and can be estimated from the elemental composition of the fuel.
Combustion was a computer program for motion graphics, compositing and visual effects.
It is commonly likened to Adobe's After Effects, and shares a timeline based interface with Autodesk Media and Entertainment's (formerly Discreet) higher-end compositing systems Inferno, Flame and Flint. This is in contrast to the node based interface used by some other compositing applications.
The last version of Combustion was Combustion 2008. The end of its development was never officially announced, but the company was known to be concurrently developing a new compositing platform, Autodesk Toxik