The primary gas needed for combustion to occur is oxygen. Combustion is a chemical reaction that typically involves the rapid combination of a fuel source—such as wood, gasoline, or natural gas—with oxygen, resulting in the release of heat and light. For combustion to take place efficiently, the mixture of fuel and oxygen must reach a certain temperature, known as the ignition temperature. This reaction produces products such as carbon dioxide, water vapor, and other by-products depending on the fuel used. Without sufficient oxygen, combustion cannot proceed effectively.