Abstract
1. The average planar and three-dimensional porosity of powders in the freely poured state are equal. 2. A freely poured powder can be represented approximatly by a model consisting of freely poured spheres containing inscribed particles. 3. In such a model the porosity of a freely poured powder is equal to the sum of the interparticle porosity and the porosity close to the particles. The interparticle porosity varies between 26 and 47% (the average being 37%). The average porosity close to the particles is equal to the average planar porosity close to the particles measured at the particle contours under the microscope as the difference between the area of the circle circumscribing the particle and the area of the particle referred to the area of the circumscribed circle.
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