The liquid does not easily wet solid, easy to move on the surface

Solid surface is hydrophilic, i.e., a liquid more easily wetted solid which angle becomes smaller, the better the wettability; if θ> 90 °, the solid surface is hydrophobic, the liquid does not easily wet solid, easily mcb circuit breaker the surface. As to electric meter the liquid to enter the capillary, this is also related with the specific liquid, not all the liquid is not completely under the larger angle into the capillary.
Wetting processes and air circuit breaker interfacial tension. A drop of liquid on a solid surface level falls, when it reaches equilibrium, and the contact angle formed between the tension of the interface.