Darcy's law (Eq XXXXXXXXXXallows us to calculate the flow rate of a fluid through a porous medium. This is not to be confused with diffusion and other fluxes discussed later which describe transport...

Darcy's law (Eq. 10.1) allows us to calculate the flow rate of a fluid through a porous medium. This is not to be confused with diffusion and other fluxes discussed later which describe transport of a component within the fluid. As an example, Darcy's law can describe flow of fluid through a tissue while diffusion formulas discussed later would describe how a drug will move through this fluid (which itself is moving through the tissue).