Table also lists mass densities ρlit for the components from the literature ([26] - ). Fig. plots the ρopt versus the ρlit. For the components that are liquids at room temperature (ICE, BCH, 1MN, TET, and MDC) the agreement is very good, which further validates the linear blending rule. On the other hand, the agreement is poor for ECO, which is a solid at room temperature. This shows that the solid phase ρ is not an appropriate value for predicting the ρ for a solid dissolved in a liquid. However, Fig 4 also shows a value of ρlit calculated for ECO using the group contribution method (GCM) of Mathieu and Bouteloup , and in this case the agreement with the ρopt is good. The GCM does not explicitly apply to a specific phase, but since it is extrapolating data measured for liquids to ECO, it generates predictions that appear to be appropriate for solids dissolved into liquids.