Clausius Statements in Detail

We now start discussing in detail with another, still earlier formulation due to Clausius  

Warme kann nie von einer niedrigeren Temperatur zu einer hoheren Temperatur flieBen. Heat will not flow deliberately from the colder body to the hotter body. 

Ludwig Eduard Boltzmann, born Feb. 20,1844, in Vienna, Austria, died Sep. 5,1906, in Duino, Italy. 

in addition to 7), 7] we have 7), 7 0 to establish dSi 0. This means at the same time that the entropy of the body with the higher temperature will decrease, 

In an isodynamic process we have dU = 0. If only heat is exchanged in two subsystems, we have for this special system 

---