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

Related Articles

Aquifer ■■■■■■
An Aquifer is an underground geological formation, or group of formations, containing water. Are sources . . . Read More
Vitreous at■■■■■
Vitreous: Vitreous refers to a surface material on some plumbing fixtures derived from or consisting . . . Read More
Confined Aquifer ■■■■■
A Confined Aquifer is an Aquifer in which Ground Water is confined under pressure which is significantly . . . Read More
Value ■■■■
German: Wert; A value is a Characteristic of the environment that is desired. In the past, the term "environmental . . . Read More
Acid Neutralizing Capacity ■■■■
An Acid Neutralizing Capacity is Measure of ability of a Base (eg. water or soil) to resist changes in . . . Read More
Conductance ■■■■
A Conductance is a rapid method of estimating the Dissolved Solids content of water supply by determining . . . Read More
Specific conductance ■■■■
A specific conductance is a measure of the ability of water to conduct an electrical current as measured . . . Read More
Energy ■■■■
An Energy is the power to do work. Making new items from recycled ones takes less Energy than making . . . Read More
Concentration ■■■■
A Concentration is the relative amount of a substance mixed with another substance. An example is five . . . Read More
Capillary Fringe ■■■■
A Capillary Fringe is the porous material just above the water table which may hold water by capillarity . . . Read More