We tested Parsley's ability to model condensed phase properties by using it to compute densities, enthalpies of vaporization, static dielectric constants, enthalpies of mixing, and excess molar volumes, of organic liquids and mixtures, and comparing with experimental data from NIST's ThermoML. Note that no condensed phase data were used in the fitting process. As shown in Figures and, the new Parsley force field offers competitive performance for these data, with marginal, though not statistically significant (by comparison of the root-mean-square errors and their 95% confidence intervals), improvement over the previous SMIRNOFF99frosst 1.1.0 release (Table ). The overall accuracy also is similar to that of the established GAFF family of force fields. This pattern presumably reflects the fact that these physical properties are not sensitive to the valence parameters optimized here, and that condensed phase data were not used to guide the optimization. V excess (x) cm 3 /mol