1. Flame Heart. The dark and blue parts in the center are composed of gases that can burn but have not yet burned.

2. Inner flame. The brightest part surrounding the center of the flame is the part of the gas that is not completely burned. Containing carbon particles, it emits strong light when heated and has a reducing effect, also known as reducing flame.

3. External flame. The outermost light yellow or transparent area is called the reaction zone. It is the part of the gas that is completely burned. Containing excess and strong hot air has oxidation effect, also known as oxidation flame.

The range from the center of the flame (or starting plane) to the outer boundary of the flame is gaseous combustibles or vaporized combustibles, which are undergoing violent or relatively violent oxidation reactions with combustion aids.

Extended information

In a chemical reaction, when the total energy of the reactants is greater than the total energy of the products, part of the energy diffuses outward in the form of heat energy, which is called an exothermic reaction. The heat energy released outward accumulates around the reaction zone, heating the surrounding air, causing the surrounding air molecules to move at high speed. The faster the movement speed, the higher the temperature.

The flame is divided from near to far from the reaction zone:

1. Flame center, the particle movement speed is low, the spectrum is concentrated in the infrared region, and the temperature is low.

2. Inner flame, the particle movement speed is medium, the spectrum is concentrated in the visible part, the brightness is the highest, and the temperature is high.

3. In the outer flame, the particles move the fastest, the spectrum is concentrated in the ultraviolet region, the temperature is the highest, and the brightness is high.

Baidu Encyclopedia - Flame