Determine the range of velocities over which a bed of granite particles $\left(S G=3.5, \mathrm{a}_{\mathrm{s}}=0.012 \mu \mathrm{m}^{-1}\right.$, $\psi=0.8, \mathrm{~d}=0.6 / \mathrm{a}_{\mathrm{s}}$ would be fluidized using the following fluids:

(a) Water at $70^{\circ} \mathrm{F}$

(b) Air at $70^{\circ} \mathrm{F}$ and $20 \mathrm{psig}$