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Physics
Classical Physics
Thermodynamics
Understanding Entropy: From Thermodynamics to Transport Equations
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[QUOTE="shonen, post: 2993770, member: 156658"] From second law of thermodynamics one can obtain an expression for [URL='https://www.physicsforums.com/insights/grandpa-chets-entropy-recipe/']change in entropy[/URL] of a system developed by Classius. All thermodynamic systems can be looked at as a reservoir. ds=[tex]\oint[/tex]DQ/T---(1) Ds- Change in entropy in the system brought about by reversible heat transfer between system, and surrounding, during some time dt DQ- Heat transfer either absorbed or removed from system during some time dt. T- Temperature of reservoir Now, question is how does one reach from this general expression formed form Stefan-Boltmzman law, corresponding entropy. DQ=[tex]\epsilon[/tex][tex]\sigma[/tex](Te^4- Ts^4) Te- Surface Temperature of the surface Ts- Surface temperature of the body Ds= 4/3[tex]\epsilon[/tex][tex]\sigma[/tex](Te^3-Ts^3) Also its puzzling as well how one can obtain this expression as well for how one can obtain the following expression for entropy in this form. NRln(Pf/Po)=ds Any recommended reading text will be appreciated. [/QUOTE]
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Physics
Classical Physics
Thermodynamics
Understanding Entropy: From Thermodynamics to Transport Equations
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