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Which of these statements hold true?

a) Diffusive flux is always positive
b) Diffusive flux is positive in the direction of the positive gradient of fluid property
c) Diffusive flux is positive in the direction of the negative gradient of fluid property
d) Diffusive flux is always negative

Answer: c
Explanation: Diffusive flux is positive in the direction of the negative gradient of fluid property. Example, heat is conducted in the direction of decreasing temperature.

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