Vim ΔU=0, ΔS yuav zoo thiab cov tshuaj tiv thaiv yuav tshwm sim.
Delta S yog dab tsi rau qhov kev sib cais?
Txij thaum lub kaw lus cais tawm, tsis muaj kev hloov pauv tshwm sim hauv ib puag ncig. Yog li, ΔˆS=0; thiab txij li ΔS + ΔˆS>0, peb muaj ΔS>0.
Yuav ua li cas yog qhov txiaj ntsig ntawm ∆ U thiab ∆ s rau qhov kev sib cais?
Thermodynamics. Rau qhov kev sib cais, ∆U=0, ∆S yuav ua li cas? … Yog li ntawd, qhov chaw muaj ntau dua rau txhua qhov roj sib txawv xws li kev ua haujlwm tsis zoo. Qhov no qhia tau tias ∆S > 0 i.e. ∆S yog qhov zoo.
Tus nqi ntawm Delta S yog dab tsi rau qhov kev sib cais?
Teb tiav: Tus nqi ntawm \[Delta S] nyob rau hauv ib qho kev sib cais yuav yog positiveLub cim \[Delta U] sawv cev rau kev hloov pauv hauv lub zog sab hauv ntawm lub cev, thiab lub cim \[Delta S] sawv cev rau kev hloov pauv hauv entropy ntawm lub system. Entropy sawv cev rau qhov randomness ntawm ib qho system.
Lub cev qhov twg yog xoom rau qhov kev sib cais?
Kev piav qhia: Rau ib qho kev sib cais uas tsis muaj kev sib pauv ntawm lub zog nrog ib puag ncig Q=0 thiab kuj dS>=dQ / T. 2. Raws li lub theorem entropy, entropyntawm ib qho Cov txheej txheem cais tsis tuaj yeem txo qis thiab yuav nyob tas li tsuas yog thaum cov txheej txheem thim rov qab.
