Question

why angle of contact is acute for water glass pair​

Answer 1

Explanation:

Here, P is the molecule that is deflected in the liquid. Here, the adhesive force between the pair will be very large as compared to the cohesive force. ... Therefore, the shape of the liquid will become concave and the tangent to the surface will become an acute angle with the surface.

Answer 2

why angle of contact is acute for water glass pair
Because the contact has a special propert that reflect the light in curved motion from 0 to 90 degree