Thaum tus neeg saib xyuas tshuaj dawb thiab cov xim uas tsis cuam tshuam nrog nws tau sib xyaw ntawm tib xim lo xim (Vat dyes zwm rau hom no), xim tawm xim tuaj yeem nqa tawm. Yog li no, thaum lub zas daj uas tsim nyog (xws li lub zas zas xim) muaj kev sib xyaw nrog cov tshuaj pleev xim dawb, cov xim daj xim daj tuaj yeem luam tawm ntawm cov ntaub xiav.
Vim tias cov xim tom qab ntawm cov khaub ncaws luam ntawv yog thawj xim los ntawm cov xim zas, yog tias cov xim tom qab luam tawm rau tag nrho hauv pem teb, xim ntawm cov xim tom qab yog ntau nplua nuj thiab tsaus dua. Nov yog lub ntsiab ntawm kev siv khaub ncaws luam ntawv.
Kev siv tshuab luam ntawv tuaj yeem luam tawm los ntawm cov menyuam luam ntawv thiab tshuaj ntsuam luam ntawv, tab sis tsis hloov ntawm thermal hloov luam ntawv. Vim tias tus nqi tsim tawm ntawm cov ntaub qhwv tawm ntau heev yog piv nrog cov luam ntawv ncaj qha, nws yog qhov yuav tsum tau ua tib zoo thiab raug tswj kev siv cov khoom siv txo tus neeg. Cov ntaub luam ntawv raws li txoj kev no tau muag zoo thiab tus nqi siab dua. Qee zaum, tus neeg sawv cev txo qis siv hauv cov txheej txheem no tuaj yeem tsim kev puas tsuaj lossis puas ntawm daim ntaub ntawm cov qauv luam tawm.
Yog tias cov xim keeb kwm yav dhau los ntawm sab pem hauv ntej thiab tom qab ntawm cov ntaub yog tib xim (vim tias nws yog xim dyed), thiab tus qauv yog xim dawb lossis xim txawv ntawm cov xim keeb kwm yav dhau, nws tuaj yeem lees tias nws yog paug tawm ntaub; kuaj xyuas qhov thim rov qab ntawm tus qauv kom zoo zoo, nws yuav Qhia tawm cov keeb kwm ntawm cov xim keeb kwm yav dhau (vim li cas rau qhov tshwm sim no yog cov tshuaj lom neeg uas ua rau cov xim tsis zoo tuaj yeem nkag mus rau sab nraud ntawm daim ntaub).
