.Simple and composite systems, stable equilibrium states. Adiabatic work interaction, heat interaction, internal energy, First law. Reversible processes, heat engines, Second law, Theorem of Clausius, entropy, combined first and second law. Legendre transforms, representations of the fundamental equation. Equilibrium: extremum principles, membrane, phase and reaction equilibria. Single phase systems: Thermodynamic relations among variables. Solutions, partial molal properties, solution models. Phase rule, unary, binary and ternary phase diagrams. Thermodynamics of phase diagrams. Reacting systems, gas phase reactions, Ellingham diagrams, Pourbaix diagrams.