What is located in the continuously flaming region of a flame?

The continuously flaming region of a flame, commonly referred to as the combustion zone or flame zone, is typically found in the lower half of the flame. This region is where the fuel and oxidizer (usually oxygen from the air) mix and combust at a sustained rate, producing the visible flame. In this area, the combustion reactions are occurring actively, and this is where the highest temperature is usually observed due to the ongoing exothermic reactions releasing energy.

In contrast, the upper half of the flame often transitions into the cooler regions where unburnt gases may rise and stabilize, potentially undergoing further oxidation only if there is sufficient mixing with air. The plume, on the other hand, pertains to the gases and particles that exit the flame and rise upward, reflecting a different aspect of flame dynamics rather than the specific action of combustion. The ignition point refers to the location or condition necessary for the combustion process to initiate, which does not describe a sustained flaming region of the flame. Therefore, the lower half is where the continuous flaming is predominantly occurring.