Question

the angle of contact at the interface of a liquid-glass is greater than 90°​

Answer 1

Answer:

2.5.

Contact angle of a water drop with a solid surface; &lt;90° indicates wetting (a) and ≥90° indicates nonwetting (b). If the contact angle between a liquid and a solid is <90°, the liquid will wet the surface and spread over it. If the contact angle is ≥90°, the liquid will stay on the surface as a bead.