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We present a fluidized bed apparatus that enables us to test the bulk mechanical properties such as the yield stresses and compressibility of fine cohesive powders. Every measurement is preceded by driving the powder into the bubbling regime in which the material loses memory of its previous history. Then the gas flow is set to a given value to take the powder into a well defined and reproducible initial state of low consolidation. Reverse flow is used to exert high compressive stress. Adoi:10.14356/kona.2004011 fatcat:kujgcpm44bhfzf55omwxczshha