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→Extension of Darcy's law
* V<sub>p</sub> = pore volume
* V<sub>p</sub> = pore volume
[[file:fundamentals-of-fluid-flow_fig3.png|thumb|left|{{figure number|3}}Two-phase relative permeability.]]
[[file:fundamentals-of-fluid-flow_fig3.png|thumb|{{figure number|3}}Two-phase relative permeability.]]
The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>:
The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>: