In order to describe the transport process in a ternary diffusion system, we need 4 inter-diffusion coefficients. Why?

In order to describe the transport process in a ternary diffusion system, we need 4 inter-diffusion coefficients. Why? Correct Answer Linear extension of ficks law

By using linear extension of Fick’s law we introduce the cross or off-diagonal diffusion coefficient which relate the flux of one component to the composition gradient of the other independent constituent. Hence we require 4 diffusion coefficient to describe the transport process.
Bissoy MCQ

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