Abstract
Variations of two-phase capillary rise were conducted with water and a number of chlorinated hydrocarbons in glass capillaries cleaned with chromic-sulfuric acid. Contact angle hysteresis due to the advance or recession of a water-organic interface was investigated, relative to the water phase. When water advanced, contact angles of 47.3-62.1 o were calculated. When water receded, equations based on the balance of interfacial and gravity forces within the capillary failed to yield single estimates of the interfacial angle. It was hypothesized that water-receding angles were approaching 0 o due to a film of water. This hysteresis was minimized in the smallest capillaries
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