The steady-state one-dimensional diffusion of a protein through a rectangular sl

Question

The steady-state one-dimensional diffusion of a protein through a rectangular slab is characterized by a __________ flux.

(a) constant (b) linear (c) time-varying (d) quadratic

I want to say it's constant, but it might be linear.

"

Steady state diffusion means that J does not depend on time. In this case, Fick’s first law holds that the flux along direction x is:

J = – D dC/dx

Where dC/dx is the gradient of the concentration C, and D is the diffusion constant. The concentration gradient is often called the driving force in diffusion (but it is not a force in the mechanistic sense). The minus sign in the equation means that diffusion is down the concentration gradient."

Explanation / Answer

Clearly the steady-state one-dimensional diffusion of a protein through a rectangular slab is characterized by a linear relation with dC/dx as it seems from the given equation.

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