Video: Vim li cas dej thiaj li ntom ntawm 4 degrees?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ntawm 4 degree centigrade, hydrogen daim ntawv cog lus yog nyob ntawm nws qhov ntev tshaj plaws. Yog li ntawd, cov molecules nyob ze heev. Qhov no ua rau siab tshaj ceev ntawm dej . Raws li qhov kub thiab txias zuj zus mus, hydrogen daim ntawv cog lus yuav tsis muaj zog yog li cov molecules ntawm dej pib drift sib nrug.
Ntawm no, vim li cas qhov ntom ntawm cov dej siab tshaj plaws ntawm 4 degree?
Cov qhov siab tshaj plaws ntawm cov dej tshwm sim ntawm 4 °C vim tias, ntawm qhov kub no, ob qhov cuam tshuam tawm tsam nyob hauv qhov sib npaug. Kev piav qhia: Hauv dej khov, lub dej molecules yog nyob rau hauv ib tug crystal lattice uas muaj ntau qhov chaw khoob. Thaum cov dej khov yaj ua kua dej , tus qauv collapses thiab cov ceev ntawm cov kua nce.
Qhov thib ob, yog vim li cas dej 4 degrees? A: 4 degrees C hloov mus rau qhov kub ntawm cov kua dej muaj qhov ceev tshaj plaws. Yog tias koj sov los yog txias nws, nws yuav nthuav. Cov dej khov ntab saum cov pas dej, tiv thaiv evaporation (thiab convection hauv txheej khov), thiab cov pas dej nyob hauv qab dej, cia cov ntses thiab lwm yam kev muaj sia nyob.
Tsis tas li ntawd, qhov ceev ntawm cov dej ntawm 4 degrees Celsius yog dab tsi?
Dej muaj nws qhov siab tshaj plaws ceev ntawm 1 g / cm33 ntawm 4 degrees Celsius . Thaum qhov kub hloov pauv los ntawm ntau dua lossis tsawg dua 4 degrees , cov ceev yuav tsawg dua 1 g / cm23. Dej muaj qhov siab tshaj plaws ceev ntawm 1 g / cm33 tsuas yog thaum nws ntshiab dej.
Thaum twg qhov kub yog dej ntau tshaj plaws?
Dej yog ntom ntawm 3.98 ° C thiab tsawg kawg ntom ntawm 0 ° C (qhov chaw khov). Dej ceev hloov nrog kub thiab salinity. Thaum twg dej freezes ntawm 0 ° C, ib tug nruj qhib lattice (zoo li lub web) ntawm hydrogen-bonded molecules yog tsim. Nws yog qhov qhib qauv uas ua rau dej khov tsawg ntom tshaj li kua dej.
Pom zoo:
Dab tsi yog qhov ntom ntom ntom ntom ntom ntom ntom?
Ib daim phiaj density yog ib qho piv txwv ntawm kev faib cov lej sib txawv. Nws yuav siv ib ntsiav ceev kwv yees los qhia qhov tshwm sim ceev muaj nuj nqi ntawm lub nce mus nce los (saib ntxiv). Nws yog ib tug smoothed version ntawm lub histogram thiab yog siv nyob rau hauv tib lub tswvyim
Dab tsi yog vim li cas ntawm qhov ntom ntom ntom?
Ntawm cov kua-cua sib cuam tshuam, qhov nro ntawm qhov chaw tshwm sim los ntawm kev nyiam ntawm cov kua molecules ntau dua rau ib leeg (vim kev sib koom ua ke) dua li cov molecules hauv huab cua (vim adhesion)
Dab tsi yog qhov txawv ntawm qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom nrog cov piv txwv?
Nws ua haujlwm nyob rau hauv ob qho tib si loj thiab me me thiab tsis yog raws li cov pej xeem ceev. Ceev dependent yam yog cov uas tswj cov kev loj hlob ntawm ib tug pej xeem nyob rau ntawm nws lub ceev thaum ceev ywj siab yam yog cov uas tswj pejxeem kev loj hlob yam tsis muaj nyob rau nws cov ceev
Vim li cas qhov ntom ntom yog ib qho khoom tseem ceeb ntawm cov dej hiav txwv?
Qhov ntom ntawm cov dej hiav txwv ua lub luag haujlwm tseem ceeb hauv kev ua kom dej hiav txwv dej ntws thiab cov cua sov ncig vim qhov tseeb tias cov dej ntom ntom ntws hauv qab qis dua. Salinity, kub thiab qhov tob tag nrho cuam tshuam qhov ntom ntawm cov dej hiav txwv. Qhov ceev yog ib qho kev ntsuas ntawm qhov nruj npaum li cas ntawm cov teeb meem tau ntim rau hauv ib lub ntim
Lub raj mis ntom ntom siv li cas los nrhiav qhov ntom ntawm cov kua?
Qhov loj thiab qhov loj ntawm cov molecules nyob rau hauv cov kua thiab ze npaum li cas lawv tau ntim ua ke txiav txim siab qhov ntom ntawm cov kua. Ib yam li cov khoom, qhov ntom ntawm cov kua sib npaug ntawm cov kua faib los ntawm nws qhov ntim; D = m/v. Qhov ceev ntawm cov dej yog 1 gram ib cubic centimeter