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# Porosity (density related)

## Description

Porosity or void fraction is a measure of the void (i.e., “empty”) spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%.
Used in geology, hydrogeology, soil science, and building science, the porosity of a porous medium (such as rock or sediment) describes the fraction of void space in the material, where the void may contain, for example, air or water.
Porosity is a complicated function of many factors, including but not limited to: rate of burial, depth of burial, the nature of the connate fluids, the nature of overlying sediments
The volume of the voids of a soil over the total volume of the sample; can alternatively be calculated from the bulk density of the sample and particles’ density
(Bulk density is a property of powders, granules, and other “divided” solids, defined as the mass of many particles of the material divided by the total volume they occupy including particle volume, inter-particle void volume, and internal pore volume).

Related formulas

## Variables

 n Porosity (dimensionless) pbulk Bulk density of the sample (g/cm3) pparticle Density of the particles (g/cm3)
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