Patent ID: 7600416

Claim:
An apparatus for measuring surface tension, comprising: a U-shaped communicating tube having a base section that defines a horizontal line, and first and second sections that extend from said base section, that are opposite to each other, and that respectively have first and second top open ends distal from said base section; and a capillary connected to and extending from said second top open end of said second section of said U-shaped communicating tube, in fluid communication with said U-shaped communicating tube, and having a top open end; wherein said U-shaped communicating tube has a diameter greater than that of said capillary such that said U-shaped communicating tube does not exhibit capillary property when a liquid is filled therein; wherein said first top open end of said first section of said U-shaped communicating tube has a height relative to said horizontal line that is greater than that of said top open end of said capillary such that the height difference therebetween is greater than that between the liquid level at said first section of said U-shaped communicating tube and a liquid drop formed on said top open end of said capillary.