COMBUSTION

[noun] [U] - the process of burningAir pollutants, such as sulphur dioxide and nitrogen dioxide, are derived mainly from the combustion of fuels in industrial plants and vehicle engines.(specialized) Combustion is also the chemical process in which substances mix with oxygen in the air to produce heat and light.A combustion chamber is an enclosed space in which combustion happens.Rockets work by burning fuel inside a combustion chamber.