3. Result and discussion
3.1. The results for the fitted f (T ,P ,I ) model
Unlike treated the β , γ and χ as constant terms in the prior work, this work introduces descriptors to correct the effects of temperature and pressure terms on thef (T ,P ,I )-QSPR model. To vividly show the difference between the two methods, the data points of ρ andη were fitted by using Eq. (1) and (2), and the scatterplot as shown in Figure 2. When β , γ and χ are constants for all ILs, the parameters in Figures 2 (a) and 2(c) (0.9991 and 0.9675 for ρ and η , respectively) are significantly lower than that of Figures 2 (b) and 2(d) (0.9999 and 0.9994 for ρ andη , respectively) where β , γ, and χ are variables for each IL. Therefore, it is necessary to introduce descriptors to modify the temperature and pressure terms for improving the model’s reliability and predictive capability.