Qeexida qaamuuska ereyga "multiphase" waa: ka kooban ama ku lug leh dhowr weji ama heerar kala duwan. Inta badan waxaa loo adeegsadaa xaaladaha farsamada ama sayniska si loo qeexo nidaamyada leh qaybo badan ama habraacyo, sida qulqulka wejiyada badan ee firfircoonida dareeraha ama falcelinta wejiyada badan ee kimistariga. Guud ahaan, ereyga "multiphase" wuxuu tilmaamayaa kakanaanta iyo kala duwanaanta, waxaana laga yaabaa inay soo jeediso baahida loo qabo falanqaynta taxadar leh ama maaraynta wejiyada iyo qaybaha kala duwan ee ku lug leh.