The gas is hot air.
Heilum combined with the light material of the balloon make it as light as air making it float.
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with material
yes, but when using Helium you must have the balloon completely sealed and used a mylar material for the balloon as Helium 'leaks-out' of ordinary materials.
The colorful part of the balloon, the envelope, is typically made of nylon but it could be made out of many other materials such as Mylar.
Carbon dioxide, the air we have in us that we breath out. Carbon dioxide doesn't make the balloon float in the air, while Helium does.
air is heavier than balloon, air rises
Piece of Cloth
If you mean a hot air balloon, it is the expansion of the air caused by the propane burner. If you mean any balloon, it is the ability of the material to hold the air or gas inside which keeps it inflated.
A small amount of air or helium within the balloon will escape through the balloon material.
Hydrogen is used. Sorry. Just regular air is used in a hot air balloon, it is heated which makes it lighter and less dense and therefore provide lift. Hence the name hot air balloon. Hydrogen is used in a gas balloon.
Hot air balloons use the fact that hot air rises as a way to make balloons fly. When the air inside the balloon is heated, it rises, and this creates lift which is used to make the balloon fly.