Figure shows that the gas phase rate constants estimated using the fitted parameters deviate from the literature values for Reactions 1 and 2. This was expected as our method does not guarantee that the fitted parameters match the true values. Moreover, Reaction 1 has a non-linear temperature dependence in a gas phase that cannot be captured by the Arrhenius equation. On the contrary, the fitted gas phase rate constants show close agreement with the literature values for Reaction 5. Both Reactions 1 and 2 are pressure-dependent and assumed to be barrierless in a gas phase while Reaction 5 is independent of pressure and has a barrier height with a clearly defined transition state. It is hence possible that our approach can provide more accurate gas phase kinetic parameters for the reactions that have transition states and do not have pressure dependence. However, it is difficult to draw a solid conclusion as the comparison was made for only three reactions. More experimental data are needed for future studies to investigate whether the fitted parameters could yield reasonable estimates of gas phase rate constants. From Figure , it can be seen that the 𝑘 gas,fitted values approach the 𝑘 liq,fitted limits as temperature approaches the critical point. This is because our functional form forces the ΔΔ𝐺 ‡ solv (𝑇 ) and 𝑘 liq to reach the limit of zero and 𝑘 gas , respectively, at the critical temperature. In fact, we can see that the literature gas phase rate constants of Reactions 1, 2, and 5 approach the same limit at around the critical point. The results seem to imply that our functional form approaches a correct limit. However, as mentioned previously, the analysis was made only using three reactions, and more experimental data are required to further verify whether our approach can provide correct limits at the critical point.