it doesn't
It is mostly to provide a good pathway for the hot air, so the least amount is lost.
Hot air rises. That is how a hot air balloon works.
A hot air balloon is not an example of conduction because conduction is the transfer of heat through direct contact between particles in a material. In a hot air balloon, heat is transferred through convection as the heated air rises and displaces the cooler air.
Yes, helium will help a balloon fly. Helium does not affect the direction that a balloon goes, but it will keep it in the air for quite some time.
That would depend on whether the balloon was empty, full of air or full of water and as you have not told us which we can not help you. When asking questions please make them specific if you want us to help.
Heating the air makes less air take up the same space, so the air inside the balloon is lighter than the surrounding air. The pilot turns off the burner to help the balloon to maintain the current altitude or to descend.
If there is warm air in the balloon, cooler air makes the balloon rise and if there is cold air in the balloon warmer air makes the balloon fall.
The air inside a hot air balloon is heated by a burner, which makes it less dense than the surrounding cooler air. This difference in density creates lift, allowing the balloon to float in the sky.
If a hole forms in a hot air balloon, the hot air inside the balloon will escape, causing the balloon to lose altitude. The pilot will need to release more heated air or descend to land safely. Regular inspections and maintenance help prevent holes in hot air balloons.
No, the movement of air from a balloon is not a contact force because the air itself is not physically touching the object it is moving. Contact forces occur when two objects are in direct physical contact with each other.
D: The hot air inside the balloon becomes less dense than the air outside the balloon.
Increasing the air pressure inside the balloon or decreasing the weight of the balloon are two factors that can make a balloon move faster. Additionally, reducing air resistance by using a streamlined shape or reducing the size of the balloon can also help increase its speed.