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Which one of the following is not the type of transfer in molecular diffusion?

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Which one of the following is not the type of transfer in molecular diffusion?

(a) Density

(b) Mass

(c) Momentum

(d) Energy

I had been asked this question in exam.

My question is based upon Role of Diffusion in Bioprocessing in portion Mass Transfer of Bioprocess Engineering

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Correct option is (a) Density

Explanation: The molecular transfer equations of Newton’s law for fluid momentum, Fourier’s law for heat, and Fick’s law for mass are very similar. One can convert from one transfer coefficient to another in order to compare all three different transport phenomena.

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