Pressure in a water container can be measured by an open vertical tube. If the expected water rise is about 20cm. What tube diameter is needed to ensure the capillary action is less than 3%?

Estimate the capillary depression for mercury in a glass capillary tube 2 mm in diameter. Use surface tension = 0.514 N/m Ans. 5.9 mm

For a liquid with the contact angle of 53.6 degrees and surface tension of 0.075 N/m, capillary rise is 2.50 m. What is the expected capillary rise in meters if the liquid is replaced with another with a contact angle of 12.7 degrees and a similar surface tension? (answer should be accurate to 2 decimal places) Answer: