当垂直毛细管与有机相接触的管分离时，测量在其末端形成的水相液滴的体积。通过平衡液滴重量和支撑液滴的界面张力，并应用修正系数，可以获得两液相之间的界面张力。然后根据液滴体积、毛细管外半径、两相密度差和重力加速度计算界面张力。

The volume of a drop of an aqueous phase formed at the end of a vertical capillary tube is measured when it detaches from the tube in contact with the organic phase. The interfacial tension between two liquid phases is obtained by balancing the weight of the drop with the interfacial tension force supporting it and applying a correction factor. Then the interfacial tension is calculated from the volume of the falling drop, the outer capillary radius, the density difference between the two liquid phases and the acceleration due to gravity.