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What is the unit of diffusion flux “J” in the Fick’s law equation?(a) mol m^−2 s^−1(b) mol m^2 s^−1(c) mol m^2 s^1(d) mol m^−2 s^1This question was addressed to me in my homework.My doubt stems from Molecular Diffusion topic in chapter Mass Transfer of Bioprocess Engineering

Answer»

Right CHOICE is (a) mol m^−2 s^−1

Explanation: J is the “diffusion flux,” of which the dimension is amount of substance per unit area per unit time, so it is expressed in such UNITS as mol m^−2 s^−1. J MEASURES the amount of substance that will flow through a unit area during a unit time INTERVAL.



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