Thaum qhov kub thiab txias yog 1000K, qhov diffusion coefficient ntawm oxygen nyob rau hauv lub khob dej qab zib-lime iav yog qis dua 10-4cm / s. Nyob rau hauv chav tsev kub, qhov diffusion ntawm oxygen nyob rau hauv lub khob yog negligible; lub khob thaiv cov pa oxygen thiab carbon dioxide rau lub sijhawm ntev, thiab cov pa oxygen hauv qhov chaw tsis nkag mus rau tib neeg.
Cov pa roj carbon dioxide tsis xau tawm ntawm lub npias, uas tuaj yeem ua kom lub freshness thiab saj ntawm npias. Iav absorbs ultraviolet rays hauv qab 350nm, uas tuaj yeem tiv thaiv cov cawv txiv hmab, dej haus, khoom noj, tshuaj pleev ib ce, thiab cov khoom siv tshuaj muaj nyob hauv nws los ntawm kev ua kom tsis zoo los ntawm cov tshuaj photochemical.
Piv txwv li, npias tsim tsw tom qab raug rau 550nm lub teeb, lub thiaj li hu ua tshav ntuj saj. Yuav tsim; Tom qab cov mis nyuj yog irradiated nrog lub teeb, vim yog lub cim ntawm peroxides thiab cov tshuaj tiv thaiv tom qab, "lub teeb saj" thiab "off-flavor" yog generated, vitamin C thiab ascorbic acid yuav txo, thiab vitamin A, Be, thiab D yuav muaj. zoo sib xws hloov, tab sis iav Qhov no tsis yog cov ntaub ntawv rau ntim.
Cov iav fwj muaj cov khoom noj xws li ua cawv txiv hmab, vinegar, thiab kua ntses. Lawv yuav tsis tsim cov ntxhiab tsw vim qhov kev ua ntawm oxygen thiab ultraviolet rays, thiab cov tshuaj pleev ib ce yuav tsis deteriorate.
Cov thawv ntim yas xws li polyethylene thiab polypropylene yuav muaj hnub nyoog thiab tso tawm tom qab raug cov pa oxygen thiab ultraviolet rays. Polyethylene monomer deteriorates saj ntawm wine, soy sauce, vinegar thiab lwm yam uas muaj nyob rau hauv cov thawv yas.
Post lub sij hawm: Dec-16-2019