POROSITY
The void spaces found in rock, sediment, or soil. Commonly measured as the percentage of void space in a volume of substance.
The property of rock or soil of having small voids between the constituent particles. The voids may not interconnect.
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.
