Gas-gas, solid-solid and solid-gas reaction equilibria. The various topics on a per domain basis are given as follows. Gaseous reaction systems: controllable equilibrium states both at constant pressure or fugacity and constant volume, thermodynamic modeling, algorithmic simulations. Solid state reactions: Raoultian and Henrian solutions, controllable equilibrium states at isothermal isobaric and isothermal isochoric conditions and rapid thermal annealing, thermodynamic modeling, algorithmic simulations. Solid gas reaction equilibria: controlling the solid state equilibria and microstructural characteristics of the solid phase by regulating the corresponding equilibria states at the vapor phase, algorithmic simulations.