porosity (rus. пористость) — the ratio of the volume of pores and voids of a solid state of matter to the volume occupied by this body.


Porosity characterises the amount of free space inside a porous material and is usually expressed as a percentage. To be distinguished is open porosity, which is the ratio of open pores of a solid to volume occupied by this body. Porosity is one of the main parameters determining the properties of sorbents, catalysts, construction materials, etc. Porosity can range for various materials from 0 (metals, etc.) to 90% or more (foams, etc.).


  • Smirnov Andrey V.
  • Tolkachev Nikolay N.


  1. Rouquerol F., Rouquerol J., Sing K. Adsorption by powders and porous solids. — London: Academic Press, 1999. — 465 p.
  2. Karnaukhov A.P. Adsorption. The texture of dispersed and porous materials (in Russian). - Novosibirsk: Nauka, 1999. - 470. p.