Answer Happy

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Please assit with this questions, i will give u a thumb up!
(i) The following equation represents the rate of flow of a commodity in mass transfer. Define the term kaiff (diffusion coefficient) in the equation and briefly explain the meaning of a negative sign in the equation. All symbols have their usual meanings. dC Q = -Kaiff A dx (ii) In the diffusion of water vapour in air, state three ordinary diffusions and their driving mechanisms. (6 marks)