Which term describes the attraction between molecules of the same substance?

Which term describes the attraction between molecules of the same substance?

• A. Adhesion
• B. Umbra
• C. Cohesion
• D. Penumbra

Answer: (C)

The main concept here is cohesion—the attraction between molecules of the same substance. This internal pull keeps the molecules in a liquid joined together, which explains why liquids form droplets, resist separating, and exhibit surface tension. Adhesion, by contrast, is the attraction between different substances (like water sticking to glass), so it describes a different kind of interaction. The other terms refer to parts of a shadow in astronomy and aren’t related to how molecules attract each other.

The main concept here is cohesion—the attraction between molecules of the same substance. This internal pull keeps the molecules in a liquid joined together, which explains why liquids form droplets, resist separating, and exhibit surface tension. Adhesion, by contrast, is the attraction between different substances (like water sticking to glass), so it describes a different kind of interaction. The other terms refer to parts of a shadow in astronomy and aren’t related to how molecules attract each other.