Fire is a combustion reaction.
Combustion is principally the oxidation of carbon in compounds by oxygen in air to carbon dioxide, carbon monoxide, or carbon itself. Combustion produces not only CO 2 and H 2 O, but also heat. The energy contained in the bonds of the products is less than the energy contained in the bonds of the reactants. The difference in energy is released as heat. Energy releasing reactions are called exothermic Calorimetry is a way to determine the amount of heat released in a reaction.