Capillary rise

Surface tension of a liquid can be determined by this method. Capillary tube which is cleaned by ultrasonic rays is mounted vertically through a hole in a cork fitted to a stand. The capillary tube should be uniform throughout its length. Liquid whose surface tension is to be measured is taken in a beaker. The lower end of the tube is kept immersed in thios liquid. The a vertical pointer is passed through the cork. The beaker now raised so that the liquid wets the inside of the tube. The pointer is now adjusted so that its tip just touches the liquid surface in the beaker.