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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.
Most hot-air balloons use propane (a liquified petroleum gas) as fuel for burners which heat the air in the balloon. The heated air has lower density than the air outside the balloon, which gives it buoyancy and generates lift.
Propane
Yes
Hot air balloons vary in size and capacity. The use of the gas would depend on this as well as other factors such as load and weather conditions.
Hot air balloon pilots use propane to heat their balloons. It's inexpensive, very easy to obtain, and works.
Hot air is used for hot air balloons.
Yes on both counts. But hot air balloons need considerably more help - they use propane burners to heat the air inside the balloon.
hot airships don't really exist. you get hot air balloons, but they're only marginally steerable. If you were to find a hot air ship, well, then lift would be provided by the hot air. The gas they'd use to create that hot air would be propane.
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.
Fire and, well, hot air.
'Hot air' balloons don't use hydrogen. They use hot air. Balloons that use hydrogen are not referred to as 'hot air' balloons. The only balloons that can accurately be referred to as 'hot air' balloons are the members of the balloon population that derive their lift/buoyancy from the presence of hot air. Of course, if a balloon used no hot air, then it could freely be referred to as a 'hydrogen' balloon, a 'helium' balloon, a 'water' balloon, etc., depending in congruent harmony with the nature of whatever substance had been chosen with which to inflate it it in order to maintain its fulsome shape.
Most hot-air balloons use propane (a liquified petroleum gas) as fuel for burners which heat the air in the balloon. The heated air has lower density than the air outside the balloon, which gives it buoyancy and generates lift.
Propane
The first use of hot air balloons was in the American Civil War for surveillance of troop movements.
Yes
Yes