“…The first preparation of glasses via pressure densification was by Tammann and Jenckel [21], with the technique having been applied to many materials: inorganic glasses such silica [28,29], hydrogen bonded liquids (phenolphthalein [21,22,38], sucrose [22], and glycerol [23]), the protic ionic liquid carvedilol dihydrogen phosphate [25], rosin (a mixture of organic acids) [21], and polymers including polyvinylethylene (PVE) [24], polystyrene (PS) [27,39,40], polymethylmethacrylate (PMMA) [41,42] and polyvinylchloride (PVC) [43]. In all cases it was reported that the glass cooled under pressure was denser, implying that none of these materials are Roskilde-simple.…”