Umswakama usho inani lomhwamuko wamanzi emoyeni. Uma lina, umkhathi umanzi kakhulu ngoba kunomhwamuko wamanzi omningi emoyeni. Ngokuphambene nalokho, uma umhwamuko wamanzi emoyeni uncane kakhulu, umoya uyancipha. Inani lomhwamuko wamanzi emoyeni livezwa umswakama olinganiselwe.
Umswakama ohlobene uyisilinganiso sokucindezela okungaphelele komusi kuya ekucindezelweni komhwamuko ogcwele wamanzi ekushiseni okuthile (umusi ungumhwamuko wamanzi). Umswakama ohlobene uvezwa ngamaphesenti, ohlelwe ngokwezibalo:
Kukhona igama elisha, okungukuthi ukucindezela okungaphelele. Ukucindezela okungaphelele ukucindezela okunikezwa yigesi ngayinye emoyeni. Umoya uqukethe izinhlobo ezahlukene zegesi. Kukhona i-nitrogen (78%), i-oxygen (21%), i-argon (0.90%), i-carbon dioxide, umhwamuko wamanzi njll. Inani lokucindezela okungaphelele okuvela kugesi ngayinye emoyeni libizwa ngokuthi ukucindezela okuphelele (ukucindezela okuphelele = ukucindezela komoya = ukucindezela komoya). Uma kungekho mhwamuko wamanzi emoyeni, khona-ke ukucindezela okungaphelele komhwamuko wamanzi = 0. Ngokuphambene nalokho, ukucindezela okungaphelele komhwamuko wamanzi kuphezulu uma ukucindezela okungaphelele komhwamuko wamanzi = ukucindezela komhwamuko kugcwele amanzi. Ukucindezela komhwamuko ogcwele amanzi kuncike ekushiseni.
Uma ingcindezi engaphelele yesitimu = ingcindezi yomhwamuko ogcwele (umswakama ohlobene = 100%), khona-ke umoya ugcwala umhwamuko wamanzi. Lapho umoya ugcwala umhwamuko wamanzi, umhwamuko wamanzi emoyeni ucishe ufinyelele inani lawo eliphezulu. Uma ingcindezi engaphelele yomhwamuko wamanzi > ingcindezi yomhwamuko ogcwele (umswakama ohlobene > 100%), khona-ke amanzi agcwala kakhulu. Lapho umoya ugcwala kakhulu, umoya awukwazi ukumelana nomhwamuko wamanzi. Ngenxa yokuthi umoya awukwazi ukumelana nomhwamuko wamanzi, khona-ke umhwamuko wamanzi owengeziwe uzogcwala ube ngamanzi. Izinga lokushisa lapho umhwamuko wamanzi ugcwala khona ube amazolo libizwa ngokuthi iphuzu lamazolo.
