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Matter in Our Surroundings — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
MCQ
Which of the following is a surface phenomenon?
  • A
    Boiling
  • ✓
    Evaporation
  • C
    Dilution
  • D
    None of the above
✓

Answer

Correct option: B.
Evaporation
Boiling is a bulk phenomenon because all molecules gain energy on heating.Evaporation is a surface phenomenon as the molecules of the surface gets sufficient energy to overcome the force of attraction which will help in converting to the vapour phase.
Dilution is also a bulk phenomenon as the volume of solution increases throughout the bulk of the solution.

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