Cov txheej txheem kev tsim cov pa oxygen cryogenic & oxygen & nitrogen cov txheej txheem qhia txog cov txheej txheem qis rau hauv cov khoom sib cais huab cua, uas txo cov kev siv hluav taws xob ntawm huab cua sib cais thiab txhim kho kev nyab xeeb ntawm kev ua haujlwm.Cov khoom siv tshuaj sib raug zoo yog siv rau hauv cov txheej txheem suav thiab cov cuab yeej siv hauv tsev tsim rau cov txheej txheem distillation suav thiab cov qauv suav kom paub meej cov khoom siv siab thiab txhim khu kev qha.