Tobacco smoke inside a room tends to hang in mid-air rather than disperse. Hot smoke rises, but tobacco smoke cools rapidly, which stops its upward climb. Since the smoke is heavier than the air, the smoke starts to descend
Utsi wafodya mu chipinda umakonda kukhala m’malere osachoka ayi. Utsi otetha umakwera m’mwamba koma uti wafodya umazizila chimene umapangitsa kuti usapite m’mwamba. Nde pakuti utsi ndiwolemela kuposa mpweya utsi umayamba kutsika