is well cleaned). This is shown in Figure 10.22a. If the diameter of the tube is
not more than a few mm, the meniscus in the tube is a nearly perfect half
sphere, readily allowing calculation of the Laplace pressure. This pressure
difference is compensated for by the weight of the water column, as is
FIGURE10.22 Capillary phenomena. (a) Rise of liquid in a capillary if the contact
angley¼0 (perfect wetting).pis pressure,gis surface tension,ris mass density, and
g¼9.81 m?s^2. (b, c) Effect of contact angle.