Boiling and evaporation, respectively, are _______ and ______ phenomena.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. bulk, surface.
Boiling is a bulk phenomenon because it occurs throughout the liquid, with vapour bubbles forming inside and rising to the surface. In contrast, evaporation is a surface phenomenon, occurring only at the liquid’s surface, where molecules with sufficient kinetic energy escape into the air.