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Chapter 14: External Diffusion Effects on Heteregeneous Reactions
Where VA is the particle velocity of A which is the vector average of millions of A molecules at a point. VA is the velocity wrt to a stationary coordinate, e.g., the lab bench.
where V is the molar average velocity of all species
multiplying by the total concentration.
JA tells us of the flux of A with respect to the molar average velocity.