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Liquid between two horizontal rails.The contact angle is 100 degrees on the top rail, and 31 degrees on the bottom rail. The net effect is enough wetting to make the liquid move forward. Note that the liquid does not fully wet the top rail out to its sides, since the narrowness of the the bottom rail and the contact angle of 100 degrees on the top ns flat free surface behind the front make the fully wetted top geometrically not possible. [an error occurred while processing this directive] |