Question

why does a drop of water is stick to the surface of a glass​

Answer 1

Answer:

Adhesion is responsible for a meniscus and this has to do in part with water's fairly high surface tension. ... And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.

Answer 2

Due to the adhesive force ( the force of attraction between molecules of different kinds is called adhesion) a drop of water sticks to the surface of glass.