Abstract Capillary binding forces caused by liquid bridges between a solid body and a liquid surface, or between two solid bodies, are experimentally measured. Based on the results, a new method for analytical estimation of the binding force is proposed and the interrelations among various similar methods so far proposed are discussed. Next the validity of the circular approximation for the meridian curve of the bridge surface is quantitatively examined and the conditions required for use of this approximation are clearly stated. Then for the cases where this approximation is allowable, some characteristcis of a very small bridge: binding force, pressure deficiency and vapor pressure of the liquid etc. are discussed. Finally a method to improve the circular approximation is suggested.
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