Question

A long capillary tube with both ends open is filled with water and set in a vertical position. What will be the height of the column of water remaining in the capillary if the radius is 1 mm? Neglect the thickness of the walls. The surface tension of water is 10 dyn/cm.

Answer 1

Explanation:

The water in the vertical tube will be supported by an upper and a lower meniscus, (Fig.), each of which will act on the water with a force F = 2πrα. Hence the height of the water column in the tube is determined from the equation