6048. A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is September 7, 2025 by Admin 25.61 kPa 11.77 kPa 14.86 kPa 21.13 kPa ✅ The correct answer is option B.