\(\alpha_T = \frac{k_T}{(x_A x_B)}\), where \(k_T\) is the thermal diffusion ratio, and \(x_A\) and \(x_B\) are the local amount-of-substance fractions of the two substances \(A\) and \(B\).
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\(\alpha_T\)
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Thermal diffusion is a phenomenon in which a temperature gradient in a mixture of fluids gives rise to a flow of one constituent relative to the mixture as a whole. in the context of the equation that describes thermal diffusion, the "Thermal Diffusion Factor" is .