The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?

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The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?

A. S1/S2
B. S1.S2
C. S2/S1
D. 1/S1.S2