Cov raj iav yog cov thawv cylindrical uas pom tseeb, feem ntau yog ua los ntawm iav. Cov raj no pom ntau yam kev siv hauv tsev thiab kev lag luam. Siv los ntim cov kua, cov pa roj thiab txawm tias cov khoom khov, lawv yog cov cuab yeej tseem ceeb hauv chav kuaj mob.
Ib qho ntawm kev siv cov raj iav feem ntau yog nyob rau hauv chemistry thiab physics laboratory. Cov kws tshawb fawb siv cov raj iav los ua kev sim, ua cov tshuaj lom neeg, thiab ntsuas cov yam ntxwv ntawm cov khoom sib txawv. Cov raj iav muaj ntau qhov ntau thiab tsawg thiab duab sib txawv, nyob ntawm hom kev sim. Piv txwv li, cov raj ntev, nyias siv los ntsuas qhov ntws ntawm cov kua thiab cov pa roj, thaum cov raj luv, dav siv rau kev sib tov cov kua thiab hmoov.
Ntxiv rau cov chaw kuaj mob, cov raj iav siv rau ntau yam kev lag luam rau cov txheej txheem xws li distillation, filtration, thiab chromatography. Hauv distillation, cov raj iav siv los cais cov khoom sib txawv ntawm cov khoom sib xyaw raws li lawv cov ntsiab lus kub. Hauv kev lim dej, cov raj iav siv los cais cov khoom me me ntawm cov kua. Hauv chromatography, cov raj iav siv los cais cov khoom sib txawv ntawm cov khoom sib xyaw raws li qhov hnyav molecular.
Ntxiv rau lawv txoj kev siv hauv chaw kuaj mob thiab kev lag luam, cov raj iav kuj muaj nyob txhua qhov chaw hauv lub neej txhua hnub. Piv txwv li, cov raj iav siv los tuav paj hauv cov thoob thiab rau kev kho kom zoo nkauj hauv tsev thiab chaw ua haujlwm. Lawv kuj siv los ua cov cim neon, vim tias cov raj iav tau ntim nrog neon lossis lwm yam roj kom tsim lub teeb ci.
Lwm yam kev siv cov raj iav txhua hnub yog nyob rau hauv kev kho mob. Cov raj iav yog siv los sau thiab khaws cov qauv ntshav rau kev kuaj mob hauv chaw kuaj mob nrog rau kev txhaj tshuaj thiab kev hloov ntshav. Cov tsev kho mob kuj siv cov raj iav los saib xyuas cov roj hauv cov ntshav ntawm cov neeg mob.
Thaum kawg, cov raj iav siv rau hauv kev lag luam khoom noj thiab dej haus los khaws thiab thauj cov kua xws li mis nyuj, kua txiv hmab txiv ntoo thiab npias. Cov raj iav yog cov nyiam los ntawm kev lag luam rau nws qhov meej, uas tso cai rau kev saib xyuas yooj yim ntawm cov ntsiab lus, thiab lawv qhov kev tiv thaiv rau cov tshuaj lom neeg uas tuaj yeem cuam tshuam rau qhov zoo ntawm cov kua.
Xaus lus, cov raj iav yog ib yam cuab yeej siv tau ntau yam uas muaj ntau yam kev siv hauv ntau qhov chaw los ntawm chav kuaj thiab kev lag luam mus rau lub neej txhua hnub. Txawm koj yog ib tug kws tshawb fawb hauv koj chav kuaj lossis ib tug tswv tsev kho kom zoo nkauj koj chav nyob, cov raj iav yeej yuav pab tau. Tsis muaj qhov tsis ntseeg tias cov raj iav yog ib feem tseem ceeb ntawm lub neej niaj hnub no thiab nws qhov muaj txiaj ntsig tsis tuaj yeem hais ntau dhau.
Lub sijhawm tshaj tawm: Tsib Hlis-18-2023