A vertically held packed bed has a height of 1 m, and a void fraction of 0.1. when there is no flow through the bed. The incipient (minimum) fluidization is set in by injection of a fluid of density 1 kg m^-3. The particle density (ρ_p) of the solids is 3000 kg m^-3. Acceleration due to gravity is 9.81 m s^-2. The pressure drop (in Pa) across the height of the bed is _______ (round off to nearest integer).