Vim li cas dej thiaj li ntom ntawm 4 degrees?
Vim li cas dej thiaj li ntom ntawm 4 degrees?

Video: Vim li cas dej thiaj li ntom ntawm 4 degrees?

Video: Vim li cas dej thiaj li ntom ntawm 4 degrees?
Video: Vim li cas koj lub neej thiaj li tsis txawj muaj nyiaj yog ua cas? ( How to Change your life) 2024, Kaum ib hlis
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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.

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