So if you think of a hot-air balloon, or you look at this picture of lanterns in Thailand at a festival, you can see that hot air can propel gasses upward.
Nese mendon per nje balone me ajer te nxehte, ose shikoni kete foto me fanare ne nje festival ne Tajlande, mund te vereni se ajri i nxehte ve ne levizje gazrat perpjete.