System and its surroundings, properties of a substance, thermodynamic equilibrium, ideal gas equation of state, energy, transfer of energy between system and its surrounding, change state and thermodynamic process, reversible and irreversible processes, simple system, enthalpy, constant-volume and constant-pressure specific heats, pure substance thermodynamic surfaces, the first law of thermodynamics for a control volume, the second law of thermodynamics, entropy, numerical value of entropy, the second law of thermodynamics for a control volume.