Burning is the rapid oxidation of the millions of vapor molecules.The molecules oxidize by breaking apart into individual atoms and recombining with oxygen into new molecules.It is during with the breaking-recombining process that energy is released as heat and light.The heat that is released is radiant heat,which is pure energy,it radiates and travels in all directions.The heat that radiate back to the fuel is called radiation feedback.When releases more vapor,raises vapor to the area where the vapor to the ignition temperature.Air is drawn into the area when the vapor meet,the result is newly formed vapor which begins to burn and the flames increase.