Second Law of Thermodynamics

While the first law of thermodynamics states that energy is conserved, the second law establishes a direction in which a process can take place. If dS is the change in entropy and dQis the heat added and T the temperature,

$$ds~\geq {{dQ} \over T}$$ (3.15)

In addition to the above relations we may need an equation of state, $p = p(\rho,T)$

(c) Aerospace, Mechanical & Mechatronic Engg. 2005
University of Sydney