Which of the following examples best illustrates adhesion?

• A. Water molecules attracting each other to form a bead
• B. Water droplets sticking to the surface of a glass window
• C. A water strider walking on the surface of a pond
• D. Water molecules forming droplets on a leaf due to surface tension

Answer: (B)

Verified step by step guidance

1. Understand the concept of adhesion: Adhesion refers to the attraction between molecules of different substances. For example, water molecules sticking to a surface like glass or a leaf demonstrates adhesion.
2. Differentiate adhesion from cohesion: Cohesion is the attraction between molecules of the same substance, such as water molecules attracting each other to form a bead. Adhesion involves different substances interacting.
3. Analyze the examples provided: Evaluate each example to determine whether it illustrates adhesion or another property of water, such as cohesion or surface tension.
4. Focus on the correct example: Water droplets sticking to the surface of a glass window is an example of adhesion because it involves water molecules interacting with the glass surface.
5. Conclude the reasoning: The other examples, such as water molecules forming a bead (cohesion), a water strider walking on water (surface tension), and droplets forming on a leaf (surface tension), do not illustrate adhesion as clearly as water sticking to glass does.