What is Modes of mass transport?

Example 15.3 (The thickness of the double layer)

In water at $298.15\,\mathrm{K}$ ($\varepsilon_r = 78.4$) with $0.10\,\mathrm{mol}/\mathrm{L}$ of a 1:1 salt ($I = 100\,\mathrm{mol}\,\mathrm{m}^{-3}$), $\kappa^{-1} = \sqrt{78.4 \times 8.854 \times 10^{-12} \times 2479/(2 \times 96\,485^2 \times 100)} = 0.96\,\mathrm{nm}$; at $1.0\,\mathrm{mmol}/\mathrm{L}$, ten times more. A supporting electrolyte compresses the diffuse layer to a few molecular diameters.