In accordance with Boyle's Law, if the volume of the air is restricted, the pressure will increase. If there is no volume restriction, the air will expand.
Pressure builds
It evaporates.
will be hot
It evaporates.
Evaperates
IT BOILS, what kind of question is this?
If you mean a kid's balloon, nothing. If you mean a hot air balloon, then it slowly cools and thus gets denser (heavier). Therefore it needs to be re-heated periodically.
Cool Air! As the heated air rises the heated air starts getting cool. This is because the higher the air is the colder it gets. Then the heated air will be replaced with cold air. As the cold air then comes down near the ground the cool air will become heated because of the sun. Heated Air - Cool Air - Cold Air And On And On It Goes
it means you should be careful
Air expands when it is heated.
when air is heated ,air pressure decreases because the molecules are
It falls back down