Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.04
1.94
0.54
1.24

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Mass Transfer
To get high tray efficiency

Gas velocity should be very low
Liquid entrainment should be severe
Time of contact between the two phases should be less
Interfacial surface between liquid and gas phase should be large

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