The Porosity is the ability of rock material to store water. So it is a measure of the water-bearing capacity of subsurface rock. 

With respect to water movement, it is not just the total magnitude of porosity that is important, but the size of the voids and the extent to which they are interconnected, as the pores in a formation may be open, or interconnected, or closed and isolated. For example, clay may have a very high porosity with respect to potential water content, but it constitutes a poor medium as an aquifer because the pores are usually so small.

See also:
"porosity" is in the UNSPSC Code "41113906"
Permeability or porosity estimation apparatus

List of books: Porosity

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