The Capillary Rise calculator equation computes the height of liquid in a small diameter tube due to capillary force on the liquid.
INSTRUCTIONS: Choose units and enter the following:
Capillary Rise (hc): The calculator returns the rise in meters. However this can be automatically converted into other length units via the pull-down menu.
The force on the fluid is caused by the attraction between the solid and the liquid which pulls the water up into the tube. The water rises until the force of capillary attraction is offset by the force due to gravity on the water column. The surface of the water in the tube meets the walls of the tube at a contact angle that is unique to the fluid, in this case water, creating a concave upper surface to the water. The rise of the water is computed from the following:
surface tension of the water