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Porosity belongs to basic characteristics of building materials. It is a characteristic of solid or semi-rigid materials, which contain a lot of tiny and uniformly distributed cavities or holes of various shape and origin. Porosity decreases specific weight of materials, increases their insulation and other characteristics ? for example absorbability. It is defined as a ratio of pores volume in a specific amount of solid and the total volume of this amount. In the article the use of the modern confocal scanning mi...