The term PRODUCTION OF COMBUSTION can be summarized as the production of SMOKE, which is a five-letter word. SMOKE is a byproduct of combustion, which is a chemical reaction between a fuel and an oxidizer. Combustion typically occurs when a fuel, such as wood, coal, or natural gas, is combined with oxygen from the air. The heat generated from the reaction causes the fuel to burn, releasing energy in the form of heat and light, as well as SMOKE.