In a combustion reaction, a compound and oxygen react to produce a new product and heat. Flame is the most recognizable form of a combustion reaction, while an explosion is a faster form of the reaction. Many of the reactants in a combustion reaction contain mostly carbon and hydrogen atoms which react with oxygen to produce heat, CO2 and H2O. Common examples of combustion reactions include the burning of wood or fuel, and the combustion of food nutrients that power our bodies. The following balanced equation represents the combustion of natural gas (methane) used to heat many homes: CH₄(g)+2O₂(g) -> CO₂(g)+2H₂O(g)+energy.