Which among the following is the statement of the ‘Fick’s Law’?

1.	Which among the following is the statement of the ‘Fick’s Law’?
A.	The molar flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.
B.	The mass flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.
C.	The molar flux of species relative to an observer moving with the mass average velocity is proportional to the concentration gradient of the species.
D.	The molar flux of species relative to a stationary observer is proportional to the concentration gradient of the species.
Answer» B. The mass flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.

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