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_________________?

A. 25.61 kPa

B. 21.13 kPa

C. 11.77 kPa

D. 14.86 kPa

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