M/t ■ L , where M is the dimension of mass, t is the dimension of time, and L is the dimension of length. From this expression, the dimension of Kx a is per unit time or 1/t. It will be shown later in this section on absorption towers, however, that the dimensions of Kxa will not be 1 /t if mole fraction units are used for the concentrations. Both Kx and Kxa are also called overall mass transfer coefficients based on the liquid side. The corresponding overall mass transfer coefficients based on the gas side are Ky and Ky a, respectively.
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