Jet of flame

Light a candle, let it burn for a while, and blow it out again. White smoke rises from the wick. 

If you hold a burning match in the smoke, a jet of flame shoots down to the wick, and it re-lights.

 After the flame is blown out the stearin is still so hot that it continues to evaporate and produce a vapour. But as this is combustible, it can be re-lighted at once by a naked flame. 

The experiment shows that solid substances first become gaseous at the surface before they will burn in a supply of oxygen.