Adhesion refers to the attraction between two dissimilar phases, such as the attraction of water molecules to other substances. Here are some examples of adhesion:

• Water and glass: Water can "climb" upwards through thin glass tubes placed in a beaker of water due to the attraction between water molecules and the glass walls of the tube.

• Water and plant surfaces: Adhesion helps keep water drops on the surfaces of leaves and flowers in place.

• Coatings on surfaces: Adhesion is important for the adhesion of different types of coatings, such as paint on a wall or a polymer layer on a package.

Adhesion plays an important role in many daily and industrial processes, and it can be either wanted or unwanted. For example, adhesion is important for the outcome of coating processes, but it can also cause issues such as the adhesion of unwanted substances to surfaces.