Nqa cov hnab, raws li lub npe pom zoo, yog xav tau ib co khoom noj tshiab xws li cov khoom ntim zaub mov xws li lub hnab, tom qab ntim khoom zoo, tab sis kuj yuav tsum tau tawm hauv cov hnab hauv lub hnab los tsim ib qho chaw nqus tsev.
Kev ua haujlwm ntawm lub tshuab nqus tsev yog tiv thaiv kom tsis txhob muaj cua tshuab, kom paub tias huab cua sab nrauv yuav tsis sib xyaw rau hauv lub hnab hauv, thiaj li ua kom zoo dua kev txuag cov khoom, thiab cov hnab ntim muaj cov kev faib tawm, thiab tam sim no hauv daim ntawv thov, qhov ntau tshaj li aluminium ntawv ci Ntim hnab, glassware ntim thiab li ntawd.
Lub hnab ntim khoom ntim yuav tsum tau xav tau cov khoom tshiab, feem ntau hauv lub neej, cov txiv hmab txiv ntoo thiab zaub yuav tsis siv qhov ntim kev txuag no, vim cov txiv hmab txiv ntoo thiab zaub yog cov zaub mov tshiab, yuav ua pa, nqus hnab yuav ua rau poob ntawm cov pa oxygen, thiab zaub khoom noj thaum tsis muaj oxygen nyob rau hauv ib puag ncig tej yam yuav ua rau qee yam kab mob muaj sia.
