I don't get one thing: we say a hot air balloon rises as hot air is less dense than cooler air.
However, if the heat source continues to add heat to the air in the balloon, doesn't the hot air become so hot that pressure will be too high for the balloon to resist and burst? But it doesn't burst even if we continue to heat the air in balloon even for a long time?
Best Answer
Since the balloon isn't sealed and the bottom has an opening, air will escape through this opening thus preventing the point where the pressure inside the balloon is so high that it would explode.