  This study developed a simple method to measure liquid surface tension based
on curve fitting technique. In this study, the explicit lying droplet profile
function in terms of surface tension was derived by solving 2-D Young-Laplace
equation exactly, and the derived profile function was superior to the existing
approximate profile functions. By fitting the derived profile function with the
detected droplet profile image data, the liquid surface tension was then
obtained. The proposed method does not rely on any new instrument, it is quite
different in principle and simpler than the traditional methods.
