For single-phase oil flow, the proportional constant that relates flow rates to pressure differences in the original Darcy's law is broken down into two independent factors: rock [[permeability]], ''k'', and fluid viscosity, μ For a linear flow system, this gives | For single-phase oil flow, the proportional constant that relates flow rates to pressure differences in the original Darcy's law is broken down into two independent factors: rock [[permeability]], ''k'', and fluid viscosity, μ For a linear flow system, this gives |