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Question

Why is evaporation a surface phenomenon?


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Solution

Surface phenomena

  • Surface phenomena, which take place at the boundaries between liquid and solid phases, can be simply physical in nature, or chemical changes can accompany them.
  • Capillary phenomena are surface phenomena related to surface tension and resulting from the modification of liquid boundary surfaces.

Evaporation

  • Water changes from a liquid to a gas or vapor through the process of evaporation.
  • The primary pathway by which water returns to the water cycle as atmospheric water vapor from the liquid state is evaporation.
  • Evaporation is a surface phenomenon.
  • During evaporation, the molecules with higher kinetic energy escape into the air from the uppermost layer of the liquid, making it a surface phenomenon.
  • When water is exposed to sunlight for an extended period of time, the temperature of the water rises.
  • As a result, the hydrogen bonds of water at the surface start to break, and the dissociated molecules start to rise.
  • As a result, evaporation occurs from the outside but not from the inside.

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