Here is an old trick that you can perform with a candle. Take a lit candle, snuff it out by blowing on it, and bring a lit match in contact with the smoke trail that arises from the candle. As shown in the first part of the video below, the fire from the match seems to “jump” very fast to the wick of the candle lighting it again. In the second part you can see how this happens when the video is slowed down to 240 frames per second.
The reason this happens is that a candle fire doesn’t just melt the wax; it also turns it into gas. When the fire is extinguished, the smoke trail that emerges from the candle carries a significant amount of wax vapor which is flammable. When this smoke trail catches fire, the rate at which it burns is faster than the rate at which it rises from the candle. As a result of this, a flame will “travel” down the smoke trail to the candle’s wick and reignite it.
Pretty cool, eh?