6.22 If we were to characterize how good a material is as an insulator by its resistance to dissipating charge, which of the following two materials is the better insulator?

\begin{aligned} &\text { Dry Soil: }\\ &\varepsilon_{\mathrm{r}}=2.5, \quad \sigma=10^{-4}(\mathrm{~S} / \mathrm{m})\\ &\text { Fresh Water: } \quad \varepsilon_{\mathrm{r}}=80, \quad \sigma=10^{-3}(\mathrm{~S} / \mathrm{m}) \end{aligned}