Which of the following examples best represents adhesion?

• A. Water molecules forming droplets on a waxed car hood
• B. Water droplets sticking to the surface of a glass window
• C. Water molecules sticking together to form a bead
• D. Surface tension allowing a paperclip to float on water

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 demonstrates adhesion.
2. Contrast adhesion with cohesion: Cohesion refers to the attraction between molecules of the same substance, such as water molecules sticking together to form a bead. This is different from adhesion, which involves different substances.
3. Analyze the examples provided: Evaluate each example to determine whether it represents adhesion or another property like cohesion or surface tension.
4. Example 1: Water molecules forming droplets on a waxed car hood. This is primarily due to cohesion, as water molecules are sticking together to form droplets, not adhering to the waxed surface.
5. Example 2: Water droplets sticking to the surface of a glass window. This represents adhesion because water molecules are interacting with and sticking to the glass surface, which is a different substance.