What happens during the ignition phase of combustion?

During the ignition phase of combustion, a self-sustaining flame is created. This phase is critical because it marks the transition from the initial heating of the fuel to the point where combustion can continue without the need for additional energy input. In this phase, the fuel and oxygen reach a temperature at which the chemical reaction can proceed at a rapid rate, leading to a sustained flame.

This self-sustaining flame is the result of the released energy from the combustion process that continues to provide heat to maintain ignition. Once this phase is achieved, the fire can grow and produce more combustion products, including smoke and gases. The ignition phase is thus essential for the fire to develop beyond just an initial spark.

In contrast, the other options are stages or effects that occur after ignition has successfully taken place. For instance, fuel consumption occurs after ignition, while smoke production increases once combustion is actively occurring. Oxygen levels may drop as a fire burns, but the initial ignition phase specifically focuses on the establishment of a sustainable flame.