Fig. 6. Density as a function of pressure ρ(P) during the compression of BC+TIP4P/2005 glycerol–water mixtures at (a) T = 80 K, (b) T = 120 K, and (c) T = 160 K. At all temperatures, increasing glycerol concentration reduces the density change during the compression process. For the present model, the LDA–HDA transformation can be identified at roughly χ _g < 5%. At higher concentrations, the density of the starting glass is high, ρ ≥ 1.1 g cm^–3, and it is unclear whether the system is in the LDA state. The compression/decompression rate is q _P = 100 MPa ns^–1.