Matt, go to the yahoo site for more information.
Toad, there is no practical difference, ther result is the same, there is however, considerable mis-understanding on the cause
Jim, top of the class today
Tuno, wrong, sorry. The balloon rises because it is displaced by the denser air around it.
The fact that it is hotter, lighter, smaller, larger or a different color does not influence its rising without the consideration of the denser air around it.
Bouyancy is not new, you are correct there

http://groups.yahoo.com/group/thermal_truth/

bagger