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, mols/m2, a: in-terfacial area per unit volume of tower)
A. $$\frac{{\text{G}}}{{{{\text{F}}_{\text{G}}}.{\text{a}}}}$$
B. $$\frac{{{{\text{F}}_{\text{G}}}}}{{{\text{G}}{\text{.a}}}}$$
C. $$\frac{{{\text{G}}{\text{.a}}}}{{{{\text{F}}_{\text{G}}}}}$$
D. $$\frac{{\text{L}}}{{{{\text{F}}_{\text{G}}}.{\text{G}}}}$$
Answer: Option A

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