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A hot air balloon is a lighter-than-air aircraft consisting of a bag called an envelope, which contains heated air. Suspended beneath is a gondola or wicker basket (in some long-distance or high-altitude balloons, a capsule), which carries passengers and a source of heat, in most cases an open flame caused by burning liquid propane. The heated air inside the envelope makes it buoyant since it has a lower density than the colder air outside the envelope. As with all aircraft, hot air balloons cannot fly beyond the atmosphere.
Created by [KevinAz61](https://sketchfab.com/KevinAz61). This model has been used under a [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/legalcode).