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## Main Question or Discussion Point

Hi,

I regard a irreversible cycle process.

It is a cylinder filled with gas, which underlies the following processes:

12: isothermal compression (reversible)

23: adiabatic expansion (reversible)

31: isochor heating (irreversible) [This happens by connecting the cylinder with a heat reservoir]

I have callculated for the irreversible process 13, that [itex]Δs_{\text{gas}} > 0[/itex] and [itex]Δs_{\text{heat reservoir}} >0[/itex].

So the [itex]Δs_{\text{gas+reservoir}}[/itex] for the full cycle should be >0.

If i would have a completely reversible process, would the enropy change of the working gas be zero?

(After the whole cycle?)

THX

Abby

I regard a irreversible cycle process.

It is a cylinder filled with gas, which underlies the following processes:

12: isothermal compression (reversible)

23: adiabatic expansion (reversible)

31: isochor heating (irreversible) [This happens by connecting the cylinder with a heat reservoir]

I have callculated for the irreversible process 13, that [itex]Δs_{\text{gas}} > 0[/itex] and [itex]Δs_{\text{heat reservoir}} >0[/itex].

So the [itex]Δs_{\text{gas+reservoir}}[/itex] for the full cycle should be >0.

If i would have a completely reversible process, would the enropy change of the working gas be zero?

(After the whole cycle?)

THX

Abby