Propane gas is used to fuel the burners that heat the air inside the balloon.
A hot air balloon is filled with regular air that's heated by a propane burner. This heated air has a lower density than the air outside the ballon, thus allowing the filled balloon to be buoyant.
Propane. This is what makes the flame that heats the air in the balloon.
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No Gas Just hot air which is why it is called a hot air balloon. If you were wondering hot air is lighter than cold air which makes it rise so when it is trapped inside the balloon the whole thing will rise.
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.
Just plain old ordinary air, but heated by the flame of the burner (which I believe burns propane gas).
Propane. This is what makes the flame that heats the air in the balloon.
The kind of balloon that holds more air is a hot air balloon. This is because they are much larger than a standard balloon.
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No Gas Just hot air which is why it is called a hot air balloon. If you were wondering hot air is lighter than cold air which makes it rise so when it is trapped inside the balloon the whole thing will rise.
An average hot air balloon can travel about 25 to 30 miles.
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.
A hot air balloon is normally powered with propane. Other than that, it is just ordinary air used inside the balloon.
The hot air has thermal energy, and when the balloon is up in the air, it also has gravitational potential energy.
If the burner fails or runs out of fuel, the hot air in the balloon (that gives it lift) would cool and the balloon would come down to earth.
Momentum
When the air is heated inside the balloon, it expands, causing it to be lighter than the surrounding (and presumably) cooler air. One imagines however, that as the air inside the balloon is heated, some air is forced out (due to expansion), thus resulting in a decrease in the entire apparatus' overall mass (not to mention a decrease in mass due to any fuel's having been used to heat the air in the balloon).
Just plain old ordinary air, but heated by the flame of the burner (which I believe burns propane gas).