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The ways of portrayal of the pressure evolution of the glass temperature (Tg)beyond the dominated Simon-Glatzel-like pattern are discussed. This includesthe possible common description of Tg(P) dependences in systems described bydtg/dP>0 and dTg/dP<0. The latter is associated with the maximum of Tg(P) curvehidden in the negative pressures domain. The issue of volume and densitychanges along the vitrification curve is also noted. Finally, the universalpattern of vitrification associated with the crossover from the low density(isotropic stretching) to the high density (isotropic compression) systems isproposed. Hypothetically, it may obey any glass former, from molecular liquidsto colloids.

New challenges for the pressure evolution of the glass temperature