Oxygen is the gas most known for contributing to combustion. It is essential for the process of burning, as many fuels require it to ignite and sustain a flame. In the presence of oxygen, substances like wood, gasoline, and other organic materials undergo a chemical reaction that releases energy in the form of heat and light. Without sufficient oxygen, combustion cannot occur, and flames will extinguish. This critical role makes oxygen a fundamental component in various applications, from simple campfires to complex industrial processes.