Suppose there is a very long (and thin) solid cylinder suspended in a stagnant liquid medium. A component (A) in the cylinder is highly soluble in the liquid, so it diffuses from the cylinder surface through the liquid medium. (Note that the cylinder is not dissolving in the liquid). Assuming steady state diffusion and the concentration of the component A at the cylinder surface (CA1) to be constant at all times, derive an expression for the concentration profile of A in the liquid medium in terms of its mass (molar) transfer rate ( ). You can take the length and radius of the cylinder as L and r1, respectively; and the diffusivity of A in the liquid as DAB.