Video: Dab tsi yog qhov tshwj xeeb kub peev ntawm ceramic?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ceramic cov ntaub ntawv xws li pob zeb lossis cib muaj tshwj xeeb kub muaj peev xwm ib 850j kg-1 K-1.
Tsis tas li lo lus nug yog, dab tsi yog qhov kub ntawm cov av?
Tshwj xeeb kub : Tshwj xeeb kub tej zaum yuav raug txhais raws li tus nqi ntawm kub yuav tsum tau nce qhov kub ntawm ib gram ntawm cov khoom los ntawm 1 ° C. Cov tshwj xeeb kub ntawm qhuav av (0.2 cal / g) tsuas yog ib feem tsib ntawm cov dej (1 cal / g).
Tsis tas li ntawd, qhov tshwj xeeb txhais tau li cas hauv cov peev txheej kub tshwj xeeb? Tshwj xeeb kub muaj peev xwm . Informally, nws yog tus nqi ntawm lub zog uas yuav tsum tau ntxiv, nyob rau hauv daim ntawv ntawm kub , mus rau ib chav tsev ntawm qhov loj ntawm cov khoom nyob rau hauv thiaj li yuav ua rau ib tug nce ntawm ib chav tsev nyob rau hauv nws kub. SI unit of tshwj xeeb kub yog joule per kelvin thiab kilogram, J/(K kg).
Tsis tas li ntawd, qhov tshwj xeeb kub muaj peev xwm ntawm graphite yog dab tsi?
Cov tshwj xeeb kub muaj peev xwm , cg, rau graphite yog li no tau raws li cg = 707.8 J−1 K−1 nrog uc = 0.9 Kg−1 K−1 ua 295.15k.
Dab tsi yog qhov tshwj xeeb kub muaj peev xwm ntawm pob zeb diamond?
Lub entropy ntawm pob zeb diamond ntawm 298.16 ° K yog 0.568 ± 0.005 cal/g-atoom/deg. Phau ntawv Journal of Chemical Physics yog copyrighted los ntawm American Institute of Physics. Cov tshwj xeeb kub ntawm pob zeb diamond tau ntsuas qhov kub ntawm 70 txog 300 ° K, thiab muab piv nrog cov qauv theoretical ntawm Debye.
Pom zoo:
Lub peev xwm tshwj xeeb ntawm octane yog dab tsi?
Octane npe Heat peev (C) 255.68 J K−1 mol−1 Std molar entropy (So298) 361.20 J K−1 mol−1 Std enthalpy ntawm tsim (ΔfH? 1 Std enthalpy ntawm combustion (ΔcH?298) −5.53–−5.33 MJ mol−1
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