Psychrometry and Grain Drying

A fluidized bed has solid particle fraction $1 - \epsilon = 0.60$, grain particle density $\rho_p = 1200\text{ kg/m}^3$, air density $\rho_a \approx 1.2\text{ kg/m}^3$, and bed height $H = 0.5\text{ m}$. Taking $g = 9.81\text{ m/s}^2$, pressure drop at fluidization $\Delta P = (1 - \epsilon)(\rho_p - \rho_a) g H = 0.60 \times 1198.8 \times 9.81 \times 0.5$ in Pa is (rounded off to nearest integer):