Smoke Rises

As pert of our "Firewise" investigation, we know that in the event of a fire we need to "Get down, get low, and get out fast".
Today though, we looked at why we have to do this.
We lit a big candle and put a glass jar partially over it. We let the candle burn for a little bit and the jar 'caught' some smoke before putting the jar completely over the candle.

What happened (beside the candle going out) was that the smoke rose to the top of the jar and there was a clear gap at the bottom. We think that s because the smoke would have been hotter that the air and as heat rises, the smoke did too.