Video: Thaum twg dej muaj qhov siab tshaj plaws?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Teb: Thaum txias los ntawm chav tsev kub kua dej ua kom ntom ntom, zoo li nrog rau lwm yam tshuaj, tab sis ntawm kwv yees li 4 ° C (39 ° F), dej ntshiab mus txog nws qhov siab tshaj plaws. Raws li nws txias ntxiv, nws nthuav dav kom dhau los ua tsawg ntom.
Hais txog qhov no, qhov siab tshaj plaws ntawm cov dej yog dab tsi?
Dej muaj nws qhov siab tshaj plaws ntawm 1g / cm23 ntawm 4 degrees Celsius. Thaum lub kub Hloov los ntawm ntau dua lossis tsawg dua 4 degrees, qhov ceev yuav dhau los ua tsawg dua 1 g / cm23. Cov dej muaj qhov siab tshaj plaws ntawm 1 g / cm23 tsuas yog thaum dej ntshiab xwb.
Tsis tas li ntawd, qhov kub ceev ntawm cov dej yog qhov tsawg kawg nkaus? Dej ceev . Dej ceev hloov nrog kub thiab salinity. Qhov ntom yog ntsuas raws li qhov hnyav (g) ib chav tsev ntawm ntim (cm³). Dej yog densest ntawm 3.98 ° C thiab yog tsawg ntom ntawm 0 ° C (kub point).
Kuj Paub, vim li cas dej ntawm nws qhov ntom ntom ntawm 4 degrees?
Ntawm 4 degree centigrade, tus hydrogen bond yog ntawm nws tsawg tshaj qhov ntev. Yog li tus cov molecules nyob ze heev. Qhov no ua rau siab tshaj plaws ntawm dej . Raws li tus kub nce mus zuj zus, tus hydrogen daim ntawv cog lus ua tsis muaj zog li ntawd tus molecules ntawm dej pib drift sib nrug.
Puas muaj qhov siab tshaj plaws?
Qhov ntom yog ib qho kev ntsuas ntawm ntau npaum li cas cov khoom muaj nyob rau hauv ib qho chaw ntim. Qhov ntau squashed ua ke ib yam khoom cov khoom yog, qhov denser nws yog. Yuav luag txhua yam khoom yuav ncav cuag lawv qhov siab tshaj plaws ntawm qhov kub thiab txias heev thiab siab heev.
Pom zoo:
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Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom