Gasoline is a good illustration. Warmth vaporizes gasoline and it all burns being a unstable fuel. There is no char. People have also realized tips on how to meter out the fuel and Regulate a fire. A candle is actually a Instrument for bit by bit vaporizing and burning wax. https://fireratedductworthinsulat35566.life3dblog.com/35292969/fire-rated-ductworth-insulation-an-overview