What element is released during the combustion of fuel besides light?

During the combustion of fuel, heat is released as a fundamental byproduct of the chemical reaction that occurs when fuel combines with oxygen. This exothermic reaction results in the release of energy in the form of heat. Heat is a crucial element in the fire behavior process as it contributes to the spread of fire, the ignition of surrounding materials, and overall fire dynamics. The intensity of combustion can often be gauged by the amount of heat produced, which also affects the temperature of the environment surrounding the fire and can influence the behavior of firefighters during suppression efforts.

While gases and smoke are products of combustion — created as materials break down and release various hydrocarbons and particulate matter — heat specifically pertains to the thermal energy that plays a central role in maintaining and spreading a fire. Additionally, sound may occur during combustion, especially in flames and explosions, but it is not considered a primary byproduct like heat, gases, or smoke.