What is required for combustion to occur after a fuel is converted into a gaseous state?

For combustion to occur after a fuel is converted into a gaseous state, the presence of an oxidizer, such as air, is essential. The process of combustion is a chemical reaction that typically requires three components, commonly referred to as the fire triangle: fuel, heat, and an oxidizer. In most cases, the oxidizer is oxygen found in the air.

When the fuel transforms into a gas, it becomes more easily mixable with the oxidizer. For combustion to ignite and sustain, a sufficient concentration of oxygen must be available to facilitate the rapid oxidation of the fuel. Without this critical element, the chemical reaction necessary for combustion cannot happen, making air (oxidizer) a fundamental requirement in the process.

While a heat source is also important for initiating combustion, the question specifically asks about what is required after the fuel has become gaseous. Hence, the focus on the oxidizer as the correct answer highlights its crucial role in enabling the combustion of gaseous fuels.