Cov khoom siv uas muaj kev tso cua hauv qhov tswb yog cov khoom siv tshiab uas siv rau kev tsim khoom kom khoom tau yooj yim dua thiab ua haujlwm zoo dua. Lawv ua haujlwm los ntawm kev tso cua hauv qhov tswb thiab tsim cov cua, uas pab tsim cov kab ntsiab hauv cov khoom zoo li plastics thiab foams. Qhov kev tsim no tuaj yeem pab ua kom khoom yooj yim dua thiab zoo dua rau kev khib rau kev hloov cua. Hauv Maijisen, peb xav tias siv cov khoom siv no kom ua kom khoom peb zoo dua, thiab peb kuj xav txog kev nyab xeeb rau lub vaj huam sib in. Yog peb paub tias cov khoom siv no ua haujlwm li cas, ces peb yuav paub tias vim li cas lawv yog txaus cuj rau hauv cov khoom uas peb siv hauv kev sib txuas, los ntawm kev siv rau kev kho khoom mus rau kev tsim tsev. Lub tswv yim tsiag tshaj plaws uas peb yuav tsum xyuam xyuas yog kev siv cov khoom siv tso cua tshuaj uas tuaj yeem pab ua kom zoo dua rau kev nyab xeeb hauv cov kev siv no.
Cov khoom siv uas muaj kev tswi tsis (endothermic) yog qhov tseem ceeb rau kev pab ua kom cov khoom zoo dua thaum ua. Thaum koj ntxuav cov khoom no rau hauv cov khoom siv, lawv pab ua cov kab laug ntau ntau. Cov kab laug no ua rau cov khoom thaum plaws yuav nyuaj dua, thiab qhov no yog tseem ceeb rau ntau yam. Piv txwv li, cov khoom nyuaj dua yog yooj yim dua rau kev xav thiab xa. Lawv kuj siv lub zog ntawm kev ua tau ntau dua, uas tuaj yeem pab koj sau lub tsho. Tsis tas li ntawd, los ntawm kev siv cov khoom siv uas muaj kev tswi tsis, cov neeg ua khoom tuaj yeem ua cov khoom uas muaj kev nyab xeeb thiab nyob ntev dua. Qhov no dhau los ntawm qhov cov kab laug pab faib lub weight raws li qhov tseeb, uas txog kev tshuav lub zog rau hauv cov khoom siv. Rau kev kho cov khoom, cov khoom kho nyuaj dua tuaj yeem pab txog kev xa khoom thiab siv cov khoom siv raws li qhov tseeb dua. Nyob rau Maijisen, peb paub tias kev xaiv cov khoom siv uas muaj kev tswi tsis yog qhov tseem ceeb heev. Cov khoom ntawv peb tsis yog tias tau txais cov kev txaus siab, tab sis lawv kuj muaj kev ua haujlwm zoo dua rau cov neeg siv. Qhov no yog tseem ceeb heev rau cov khoom uas yuav tsum tau siv ntau, piv txwv li cov khoom siv rau kev kho cov rooj ntawm tsev. Thaum peb ntxuav cov khoom no, peb tuaj yeem pab ua kom cov khoom muaj kev ua haujlwm zoo dua thiab nyob ntev dua. Ntawd li, kev siv cov khoom siv uas muaj kev tswi tsis kuj tuaj yeem pab ua kom cov khoom muaj kev tswi tsis zoo dua. Qhov no txog rau qhov cov khoom tuaj yeem tso cia cov khoom uas nyias thiab cov khoom uas huv raws li qhov tseeb, uas pab cov neeg siv sau lub zog. Yog li, cov khoom siv uas muaj kev tswi tsis yog qhov tseem ceeb rau cov khoom zoo, muaj kev ua haujlwm zoo, muaj kev nyab xeeb thiab muaj kev nyab xeeb rau lub vaj huam sib loss. Ntawd li, kev ntxuav cov khoom no kuj tuaj yeem pab... antioxidant yeej tuaj yeem txhawb nqa ntau dua rau qhov nyob tau ntawm cov khoom no.