[[File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_2.jpg|300px|thumb|{{figure_number|2}}The wetting phase rises above the original or free surface in the capillary tube experiment until adhesive and gravitational forces balance. Capillary pressure (P<sub>c</sub>) is the difference in pressure measured across the interface in the capillary (''P''<sub>c</sub> = ''P''<sub>nw</sub> - ''P''<sub>w</sub>). This pressure results from the contrast in pressure gradients caused by the different densities of the nonwetting (''ρ''<sub>nw</sub>) and wetting (''ρ''<sub>w</sub>) phases (right).]] | [[File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_2.jpg|300px|thumb|{{figure_number|2}}The wetting phase rises above the original or free surface in the capillary tube experiment until adhesive and gravitational forces balance. Capillary pressure (P<sub>c</sub>) is the difference in pressure measured across the interface in the capillary (''P''<sub>c</sub> = ''P''<sub>nw</sub> - ''P''<sub>w</sub>). This pressure results from the contrast in pressure gradients caused by the different densities of the nonwetting (''ρ''<sub>nw</sub>) and wetting (''ρ''<sub>w</sub>) phases (right).]] |