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Groundwater gradients may take extremely long periods to equilibrate to significant changes in surface pressures, depending on the hydraulic diffusivity of the rock mass (the ratio of hydraulic conductivity to storage coefficient).
Steady-state diffusion of water along the two defined pathways depends on the concentration gradient and on the diffusivity of the substance.
The normal diffusivity of the ions is in accord with the high activity of water in the channel.
Once the residue moved close enough to the lipid headgroups to interact, due to the limited diffusivity of the lipid molecules in the timescale of the simulation, the lysine residue stayed bound to the lipid headgroup region.
the diffusivity of heat
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