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I. Porosity (P)
100P
T
VP
V Where VP is the total volume of pore space
and VT is the total volume of rock or sediment.
The proportion of any material that is void space, expressed as a percentage of the total volume of material.
In practice, porosity is commonly based on measurement of the total grain volume of a granular material:
100T G
T
V VP
V
Where VG is the total volume of grains within the total volume of rock or sediment.
P T GV V V