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Q: …………is a superficial phenomenon
  • A. To boil
  • B. Melting
  • C. Evaporation
  • D. Freezing
Correct Answer: Option C - Evaporation is the process of converting a liquid into its vapour form on its surface. Evaporation is a surface phenomenon because, during evaporation, the molecules with kinetic energy dissipate into air from the topmost layer of the liquid so it is a surface phenomenon. Therefore, evaporation takes place from the surface but not from the inside of liquid.
C. Evaporation is the process of converting a liquid into its vapour form on its surface. Evaporation is a surface phenomenon because, during evaporation, the molecules with kinetic energy dissipate into air from the topmost layer of the liquid so it is a surface phenomenon. Therefore, evaporation takes place from the surface but not from the inside of liquid.

Explanations:

Evaporation is the process of converting a liquid into its vapour form on its surface. Evaporation is a surface phenomenon because, during evaporation, the molecules with kinetic energy dissipate into air from the topmost layer of the liquid so it is a surface phenomenon. Therefore, evaporation takes place from the surface but not from the inside of liquid.