For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

A. L/(FG . G)

B. (G . a)/FG

C. FG/(G . a)

D. G/(FG . a)
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