Kanjalo, Ukungaguquguquki okuphezulu kwepetroli kuthetha ukuba xa ukugxininiswa kwayo kubetha umda othile, ukuba sesichengeni kwidangatye elivulekileyo kunokukhokelela ekuvutheni okanye ugqabhuko-dubulo.
Ukungabikho kweoksijini kwindawo kuphela kwemeko apho i-petroli ingayi kuvutha. Ngokuchaseneyo, Ukugxila okungaphaya komda wokudubula kuthintele ugqabhuko-dubulo, kodwa kubukho be-oxygen, Umlilo awunakuphepheka.