  Due to nonuniform aggregation in liquid state, from the thermodynamic point
of view any glass-forming liquid in the vicinity of the liquid-to-solid phase
transition temperature, irrespective of its actual chemical composition, shall
be described in terms of a complex multicomponent solution whose comprised of
the same chemical elements components have characteristic atomic arrangement
deviating to various extent from the thermodynamic ground state with respect to
the size, shape, density, structure, and stoichiometry. Therefore, glass
transition appears to be a process of non-equilibrium solidification of
multicomponent solution upon its rapid cooling. The essential feature of this
process is that the attempts of the liquid and solid phases of the solidifying
solution to separate out are largely arrested due to quenching. Thus, the
solidification occurs in the absence of solid-liquid interface, so the
substance in the liquid-to-glass transition region is observed behaving like
fluid with rapidly growing viscosity that reflects the formation of
mechanically rigid and stable bound configurations. It is shown that glass
transition shall be classified as phase transition in multicomponent solutions
and not a standalone phenomenon.
