FIELD: electrical power engineering, chemical and other industries. SUBSTANCE: gas from source of excessive pressure is fed simultaneously over two tubes arranged at different heights to establish porosity of boiling powdery medium. Porosity is established by value of pressure difference between spaces of outlet butts of tubes, density of material of particles of powdery medium and gas in agreement with computation expression. EFFECT: elimination of effect of sizes and forms of particles on determined parameter. 1 dwg
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