Video: Vim li cas qhov ntom ntawm cov dej siab tshaj ntawm 4?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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 tsis sib npaug. Kev piav qhia: Hauv dej khov, lub dej molecules yog nyob rau hauv acrystal lattice uas muaj ntau qhov chaw khoob. Thaum cov dej khov meltsto kua dej , tus qauv collapses thiab cov ceev ntawm cov kua nce.
Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog qhov ntom ntawm cov dej ntawm 4 degree?
Dej muaj nws qhov siab tshaj plaws ceev ntawm 1 g / cm33 ntawm 4 degrees Celsius. Thaum qhov kub thiab txias hloov 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 / cm33tsuas yog thaum nws ntshiab dej.
Kuj Paub, vim li cas dej thiaj li muaj qhov ntom ntom? Cov molecules ntawm cov dej yog nyob ze ua ke, thiab qhov no nce lub ceev ntawm cov kua. Raws li qhov kub thiab txias dej txo, cov dej molecules qeeb thiab cov ceev nce. Clusterformation yog cov nyhuv loj dua, yog li cov ceev pib txo. Yog li ntawd, lub ceev ntawm dej yog ib siab kawg ntawm 4 ° C.
Ntxiv mus, nyob rau theem twg yog qhov dej ntom ntom tshaj plaws?
Ib qho tshwj xeeb tseem ceeb tsis xwm yeem siab tshaj plaws ceev yog o dej , uas ncav a ceev ncov ntawm 3.98 ° C (39.16 ° F). Qhov no muaj qhov cuam tshuam tseem ceeb hauv ntiaj teb ecosystem.
Puas yog qhov ntom ntawm cov dej siab?
Qhov ntom yog qhov loj ntawm ib chav tsev ntim ntawm asubstance. Cov qhov ntom ntom ntawm cov dej feem ntau yog muab li 1 g / cm23, tab sis hauv qab no yog qhov ntom ntawm cov dej nrog sib txawv units. Nws tsis yog coincidence uas dej muaj ib ceev ntawm 1.
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