Boiling point: nta

2024 Tus sau: Erin Ralphs | [email protected]. Kawg hloov kho: 2024-02-19 16:10

Boiling yog ib qho tshwm sim uas yog yam ntxwv ntawm cov kua. Nws yog manifested los ntawm qhov tseeb tias vapor npuas tsim thoob plaws hauv cov tshuaj. Nws yuav tsum tau muab sau tseg tias boiling yog pom tsuas yog nyob rau ntawm ib tug tej yam kub thiab nyob ntawm seb hom tshuaj. Qhov ntsuas no yog ib qho tseem ceeb yam ntxwv. Nws tuaj yeem siv los cais cov kua sib xyaw nrog rau kev txiav txim siab lawv cov purity.

qhov ntsuas no txawv ntawm cov khoom sib txawv. Yog li, qhov kub ntawm cov roj cav nce mus txog 300-490 ° C, thiab rau dej nws yog 100 ° C. Qhov ntau ntawm lub cev no nyob ntawm ntau qhov tsis sib xws, suav nrog cov xwm txheej kub kub thiab cov khoom sib xyaw ua kom sov.

Nws yuav tsum tau hais tias qhov kub hnyiab muaj qee yam yam ntxwv. Yog li, vapor siab yog tsim nyob rau saum npoo ntawm cov kua, uas yog tsim es maj mam nyob rau hauv lub xub ntiag ntawm ib tug dawb nto. Yog tias peb tham txog qhov nruab nrab ntawm qhov nruab nrab, ces nws tuaj yeem ua kom sov ntau dua li thaum boiling. Qhov no piav qhia txog qhov tshwm sim ntawm "overheating", uas cov kua tsis boil, tab sis yog tus cwj pwm los ntawm qhov ntsuas kub siab.

Nws yuav tsum tau sau tseg tias qhov kub thiab txiasboiling yog txiav txim siab siv tus pas ntsuas kub tshwj xeeb, uas yuav tsum tau muab tso rau hauv lub vapor ntawm cov khoom, thiab tsis nyob rau hauv cov kua. Nyob rau hauv cov ntaub ntawv no, mercury kem tsis yog ib txwm immersed kiag li, yog li koj yuav tsum tau coj mus rau hauv tus account qhov kho ntawm tus pas ntsuas kub. Rau cov kua sib txawv, tus nqi no txawv. Qhov nruab nrab, nws ntseeg tau tias qhov kev hloov ntawm atmospheric siab ntawm li 26 hli ua rau lub fact tias lub boiling point hloov los ntawm ib tug degree.

qhov ntsuas no pab txiav txim siab qhov purity ntawm kev sib tov thiab kev daws li cas? Lub homogeneous kua muaj ib tug boiling point. Nws qhov kev hloov pauv yog qhov tseeb ntawm qhov muaj impurities uas tuaj yeem raug cais tawm thaum lub sijhawm distillation, nrog rau kev pab los ntawm cov cuab yeej tshwj xeeb - dephlegmators.

Nws tsim nyog sau cia tias qee qhov kev sib txuas ntawm ntau yam tshuaj tshwj xeeb yog siv. Qhov no muab cov kua tshwj xeeb nta. Yog li, piv txwv li, ntshiab ethylene glycol boils ntawm 197 ° C, thiab lub boiling point ntawm antifreeze yog me ntsis qis - txog 110 ° C.

Kev hloov pauv ntawm cov kua mus rau vapor tshwm sim raws nraim thaum lub qhov kub kub mus txog qhov tsim nyog. Nyob rau hauv cov ntaub ntawv no, lub saturated vapor saum cov kua nto muaj tib tus nqi raws li lub sab nraud siab, uas ua rau cov tsim ntawm npuas nyob rau hauv tag nrho cov ntim.

Nws yuav tsum tau hais tias qhov kub yuav tshwm sim ntawm qhov kub thiab txias, tab sis nrog kev txo qis lossis nce ntxiv ntawm sab nraud, nws cov kev hloov pauv tuaj yeem pom.

Qhov no tuaj yeem piav qhia qhov tshwm sim thaum zaub mov siv sijhawm ntev los ua noj hauv roob, vim tias ntawm qhov siab ntawm 60kPa, dejtwb boils ntawm 85 ° C. Rau tib lub laj thawj, cov tais diav hauv lub cooker siab ua noj sai dua vim qhov tseeb tias qhov siab nce hauv nws, thiab qhov no ua rau muaj qhov sib xyaw ua ke ntawm qhov kub ntawm cov kua kub npau npau.

Nws yuav tsum tau muab sau tseg tias boiling yog feem ntau siv tshuaj tua kab mob lub cev. Yog tsis muaj cov txheej txheem no, nws yog tsis yooj yim sua ua noj tej zaub mov. Nws tseem yog qhov ua pov thawj tseem ceeb rau cov khoom siv roj av los tsim cov khoom pib purer.