Iyo yekubuda muutangi yemvura yekuchengetera okisijeni ndeye yakakosha technical paramende yakashandiswa kuongorora kugona kweiyo tangi kuti ichengetedze okisijeni kubva mukubuda mumamiriro ezvinhu mune static state.
Iyo mudziyo mudziyo wekumanikidzwa wekuchengetedza mvura okisijeni, mvura nitrogen, mvura argon, kabhoni digon uye imwe midhiya.
