The reason warm air rises is because it is less dense (lighter) thancolder air.

Without getting too technical:

Air contains molecules that move or agitate. This movement or agitation is greater as the temperature rises. This causes the mass of the air to expand. Although the total mass of a lump of air has not changed, the mass is more spread out and so any given cubic area of it will be lighter.

That's whythey use a "Hot air balloon" not a "Cold air balloon".
The heated air will bewarmer than the surrounding air and the balloon will rise.

Of courseswirling windscan have an affect on air and carry your scent down, but that wasn't the question.

And yes, I have taken Chemistry, I have a degree in it.

Let me put it this way, if you believe...bull81, you'll be wrong....