OCR Text |
Show Ii lloms Is tillrl Klllt I nre lr SuipoiKi n inodium sized sitting room with four peo lo nnd two gr i JeU tho nir must Isj eli mgeil our) llftj minutes to kit p It pure As nir U heated it exjanls nnd becomes li(,htir per cubic foot If all tho air Is heated equally, it remains at lint nfti r ixpauxion but if hot nil is in tho i rcfconeo of cotd air tho litter b) reason of Its In i nets forces its wnv down an 1 drlw s tho hot nir up Tho moving fnrvo of nir currents is tho greater weight of tho colder nir Ttils then Uthofoui) li) which wo nro to dri o out foul nir nu 1 put pure air in Its pttco. 1'uro external nir w ill always dri o out foul nir If you gii o It a i banco ,4ii i' ', |