Kx ([xi - [x]) is the mass of solute passing across the interfacial area per unit time per unit cross-sectional area of the interface. The interfacial area of mass transfer is largely indeterminate. To make sense of the expression, first define the term destination medium. Destination medium is the overall entity inside the control volume from or into which the gas and liquid phases flow. For example, in an aeration basin, the destination media are the bulk contents of the tank; in a packed tower, the destination media are the packings inside the tower; and in a trickling filter, the destination media are the rocks that make up the filter.
Now, invent a parameter a that defines the area of interfacial area per unit bulk volume of the mass transfer destination medium and form the expression Kxa([x*] - [x]). The dimension of Kxa ([x*] - [x]) is now mass per unit time per unit volume or
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