Qhov sib txawv tseem ceeb ntawm sublimation thiab deposition yog tias sublimation yog qhov hloov ntawm cov khoom siv rau hauv cov khoom siv roj yam tsis tau mus rau theem ua kua hos qhov tso tawm yog qhov hloov ntawm cov khoom los ntawm theem roj mus rau theem khoom tsis dhau. lub xeev kua.
Phase hloov yog hais txog kev hloov cov theem ntawm cov khoom. Cov xwm txheej sab nraud xws li qhov kub thiab txias hloov pauv cuam tshuam rau cov txheej txheem no. Piv txwv li, cov kua ua kom khov thaum peb txo qhov kub thiab txias mus rau qhov chaw khov, thiab nws yuav nkag mus rau theem roj thaum qhov kub ntawm qhov kub ntawm qhov kub. Phase hloov feem ntau muaj kev txiav txim; cov khoom nkag mus rau hauv cov kua theem thiab tom qab ntawd mus rau theem roj; los yog yog tias nws yog cov pa roj, nws yuav tsum mus dhau ntawm cov kua theem ua ntej thiab tom qab ntawd mus rau theem khoom. Sublimation thiab deposition yog theem hloov, tab sis lawv txawv me ntsis dua li ib txwm hloov raws li lawv tsis ua raws li qhov kev txiav txim no.
Sublimation yog dab tsi?
Sublimation yog txheej txheem ntawm kev hloov cov khoom siv rau hauv cov khoom siv roj yam tsis tau mus txog theem ua kua. Hauv cov lus yooj yim, cov khoom siv ncaj qha evaporates thiab dhau los ua roj yam tsis muaj kua ua ntej. Txawm li cas los xij, qhov txheej txheem no xav tau lub zog ntxiv. Yog li, qhov no yog txheej txheem endothermic. Los ntawm kev suav cov enthalpy ntawm sublimation, peb tuaj yeem xam lub zog xav tau rau cov txheej txheem no: los ntawm kev ntxiv ob qho tib si enthalpy ntawm fusion thiab enthalpy ntawm vaporization ua ke.
Sublimation tshwm sim ntawm qhov kub thiab txias hauv qab ntawm peb lub ntsiab lus ntawm cov khoom. Piv txwv li, cov khoom carbon dioxide sublimes ntawm qhov kub thiab txias (-78.5 ° C) thiab atmospheric siab. Qhov triple point ntawm carbon dioxide yog 5.2 atm thiab -56.4 ° C, thiab saum toj no, peb tuaj yeem tau txais cov pa roj carbon dioxide ua kua. Cov dej khov thiab iodine tuaj yeem ua rau sublimation.
Daim duab 1: Dej khov qhuav Sublimation
Hauv sublimation, cov khoom siv tshuaj lom neeg ntawm cov khoom sib txuas tseem tsis hloov pauv, tab sis lub cev lub cev tuaj yeem hloov pauv. Sublimation yog pab tau rau ntau lub hom phiaj. Piv txwv li, nws yog siv los ntxuav cov tshuaj chemical.
Dab tsi yog kev tso nyiaj?
Kev tso tawm yog cov txheej txheem rov qab ntawm sublimation. Nws tseem hu ua de-sublimation. Ntawm no, ib yam khoom nyob rau hauv cov roj theem hloov mus rau hauv cov khoom theem yam tsis tau dhau lub xeev cov kua nruab nrab.
Daim duab 2: Frost Formation
Tsis zoo li cov txheej txheem dhau los, cov txheej txheem no tso tawm lub zog; yog li ntawd, nws yog txheej txheem exothermic. Tsis tas li ntawd, qhov no tshwm sim thaum tsim dej khov lossis Frost. Nyob rau hauv cov txheej txheem no, dej vapor ncaj qha mus rau hauv cov khoom theem (ua dej khov los yog Frost). Thaum qhov no tshwm sim, lawv tshem tawm thermal zog rau sab nraud ib puag ncig.
Qhov txawv ntawm Sublimation thiab Deposition yog dab tsi?
Sublimation yog qhov ntxeev ntawm kev tso nyiaj. Qhov sib txawv tseem ceeb ntawm sublimation thiab deposition yog tias sublimation yog qhov hloov ntawm cov khoom siv rau hauv cov khoom gaseous yam tsis tau mus rau theem ua kua whereas deposition yog hloov ntawm cov khoom los ntawm ib tug roj theem mus rau ib tug khoom theem tsis dhau lub xeev cov kua.
Ntxiv mus, qhov sib txawv tseem ceeb ntawm sublimation thiab deposition yog tias sublimation yog endothermic whereas deposition yog exothermic.
Cov hauv qab no infographic muab cov ntsiab lus ntxiv ntawm qhov sib txawv ntawm sublimation thiab deposition.
Summary – Sublimation vs Deposition
Sublimation yog qhov ntxeev ntawm kev tso nyiaj. Txawm li cas los xij, ob qho tib si ntawm cov txheej txheem no tsis cuam tshuam rau theem ua kua. Qhov sib txawv tseem ceeb ntawm sublimation thiab deposition yog tias sublimation hloov pauv cov khoom siv rau hauv cov khoom siv roj yam tsis tau mus rau theem ua kua hos qhov kev tso tawm yog hloov cov khoom los ntawm theem roj mus rau theem khoom tsis dhau lub xeev ua kua.
