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This is similar and complementary to the description in terms of processes of sorption (adsorption) of unfrozen water with liquid-like properties in porous soil.
Within the frozen fringe, the unfrozen film thickness in ice-containing pores will decrease and ice will propagate into accessible pore spaces that were previously ice-free.
In these circumstances, there is a risk in unthinking acceptance of procedures that have been developed for unfrozen conditions.
Unfrozen water films make metabolic reactions and mass transfer of microbial metabolic end-products possible within the permafrost, preventing the cell's biochemical death.
With the unfrozen films becoming thinner as the soil becomes colder, this process decreases in importance the colder the location at which it is occurring.
The permafrost soil is known to contain unfrozen water.
The very low hydraulic conductivity in the clay also allows the development of substantial matrix potential gradients within the unfrozen soil.
Thus, in sands, the amount of unfrozen water is minimal, tending toward zero.
