They are filled with hot air. The hot air raises and take the balloon with it
When balloons float they have helium in it. Helium is not air, but a gas. It's lighter than air, which makes it float.
Hot air balloons float because hot air displaces cool air in the atmosphere
The balloons that float usually contain helium in them, which is lighter than air. This enables the balloon to float.
helium is less dense than air. :) so helium will float better than air
Helium is lighter than air. so balloons filled with helium will float in air. warming will make them float or rise up faster.
Only in water. The air from your mouth is the same density as the air in the room- they will not float in air.
which gas is in ballons
with the gas helium or fire
Magic...
Because it is a safe gas that is less dense than air, thus balloons float in air
Helium is lighter than air. so balloons filled with helium will float in air
Balloons can be filled with air (don't float), or with hydrogen or helium (float because the gas is less dense). Hot air balloons use burners to heat the air so that it becomes slightly less dense than the cooler air around it, providing some lift.