[1] The most common chemical equilibrium systems involve reactants and products in the same phase - either all gases or all solutions.
One example is gas-liquid partition equilibrium chromatography, where an analyte equilibrates between a gas and liquid phase.
The time until a partition equilibrium emerges is influenced by many factors, such as: temperature, relative concentrations, surface area of interface, degree of stirring, and the nature of the solvents and solute.
This kind of equilibrium constant measures how a substance distributes or partitions itself between two immiscible solvents.
Molecules more soluble in the liquid phase will remain longer in the column, allowing for separation using partition equilibriums.