its hot because that makes it lighter so it can float above air.
Hot air rises.
the hot air is more dense then the actual air
Hot air! Hot air is lighter than cold air.
hot air is when you get hoott
hot air rises.
Hot air is used for hot air balloons.
Hot air makes a hot air balloon rise because hot air is less dense than the cooler air around it, so the hot air balloon floats on the cooler air around it.
hot air rises
hot is hot cool air is cold
hot air or hot gas
hot air rises
to make a hot air balloon rise you use hot air