Hot air is lighter than cold air, so it rises up.
Ex.
A hot air balloon rises up because we heat the air and it goes up.
convection
convection
Convection
The hot air from the burner rises since it has little density, and then is caught in the balloon, which causes it to rise.
convection (studyisland answer)
heat
This is because of convection. Hot air rises and cool air falls which causes the balloon to rise.
Because it gets filled with hydrogen and it causes it to rise since it gets how. As we know hot air rises. Because it gets filled with hydrogen and it causes it to rise since it gets how. As we know hot air rises.
Erm.. no.. i believe its Buoyancy... this force causes u the hot air balloon to rise.. not Gravity..
Density.
Convection.
hot air rises because it is less dense than cold air..this occurs by the process of convection