Hello
Can we consider the sentence Adiabatic process cannot decrease entropy (found for example here) to be true in any circumstances ? Here I do not want to focus on any particular situation. Hence the system is not necessarily a (perfect) gas; the transformation is not necessarily quasi-static; neither the system nor the environment are necessarily in equilibrium during and at the end of the transformation.
If true and considering this statement is not presented as a thermodynamic principle, how can we deduce it from the two principles? In particular I think we cannot say that the exchanged entropy is something like ∫δQ/T as T is not necessarily a defined entity because temperature might be heterogeneous.
Thanks
Can we consider the sentence Adiabatic process cannot decrease entropy (found for example here) to be true in any circumstances ? Here I do not want to focus on any particular situation. Hence the system is not necessarily a (perfect) gas; the transformation is not necessarily quasi-static; neither the system nor the environment are necessarily in equilibrium during and at the end of the transformation.
If true and considering this statement is not presented as a thermodynamic principle, how can we deduce it from the two principles? In particular I think we cannot say that the exchanged entropy is something like ∫δQ/T as T is not necessarily a defined entity because temperature might be heterogeneous.
Thanks