What is the porosity means in medium?

Question

What is the porosity means in medium?

Answer 1

*Porosity is a measure of the void spaces in a material, and is measured as a fraction, between 0–1, or as a percentage between 0–100%.

The term is used in multiple fields including ceramics, metallurgy, materials, manufacturing, earth sciences and construction.

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. It is defined by the ratio:

φ=Vv / Vt



where Vv is the volume of void-space (such as fluids) and Vt is the total or bulk volume of material, including the solid and void components. Both the mathematical symbols φ and n are used to denote porosity.