$3\mathrm{.}4.$ Human immunoglobulin $G(HIgG)$ is diffusing through a porous medium having a porosity of $0\mathrm{.}5,$ tortuosity of $1\mathrm{.}8$ and average pore diameter of $0\mathrm{.}45$ microns. Protein samples were collected from two points within the medium separated by a distance of $20mm$ and the ultraviolet light absorbance of these samples as measured with a spectrophotometer having a sample path length of $0\mathrm{.}2cm$ were found to be $0\mathrm{.}010$ and $0\mathrm{.}012$ respectively. If the specific absorbance of HIgG is known to be $15590\frac{m^3}{k}g-$moles.cm$,$ calculate the steady state flux of this protein between the two points.