Abstract

Experiments have been made to investigate some of the causes of the hysteresis of the angle of contact of mercury against steel. It is shown by experiments in vacuo and in gases at low pressures, that adsorption on the solid surface is a principal cause of hysteresis. In contrast to the results of earlier work, however, roughness does not affect the hysteresis, though the angles of contact themselves are altered. Some agreement with theoretical predictions is obtained.

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