Glass transition as a process, in which a metastable system (the undercooled melt) is brought into a thermodynamically non-equilibrium, frozen-in state (the glass) is quantitatively considered in terms of the thermodynamics of irreversible processes. A reconsideration of existing thermodynamic treatments of the kinetics of glass transition is given using Simon's approximation, existing empirical correlations & the generalised Bragg-Williams-Vol'kenstein equation. The glass transition is considered as an example, showing to the extent the Third Principle of thermodynamics can be applied to irreversible processes and how it has to be reconsidered in a new way in non-equilibrium thermodynamics. A proof is given that, when approaching absolute zero of temperature, configurational entropy values, S(0)>0, are frozen-in into glasses.
