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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.