![The-heated-air-inside-the-envelope-makes-it-buoyant,-since-it-has-a-lower-density-than-the-colder-air-outside-the-envelope](https://videocdn.cdnpk.net/euphony/content/video/partners2290/thumbnails/BB_bf2332a8-15f0-40d0-9309-0c43403f8455_small.jpg)
The heated air inside the envelope makes it buoyant, since it has a lower density than the colder air outside the envelope
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