Question

what is combustion??
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Answer 1

the chemical process in which a substance burn in air or oxygen with the release of heat and light energy is called combustion

Answer 2

Combustion, or burning,[1] is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and anoxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. Combustion in afire produces a flame, and the heat produced can make combustion self-sustaining. Combustion is often a complicated sequence of elementary radical reactions. Solid fuels, such as wood and coal, first undergoendothermic pyrolysis to produce gaseous fuels whose combustion then supplies the heat required to produce more of them. Combustion is often hot enough thatincandescent light in the form of eitherglowing or a flame is produced. A simple example can be seen in the combustion ofhydrogen and oxygen into water vapor, a reaction commonly used to fuel rocket engines. This reaction releases 242 kJ/mol of heat and reduces the enthalpy accordingly (at constant temperature and pressure):