why do we say that evaporation is a surface phenomenon

the liquid evaporates when the molecules of it gains more kinetic energy than the attractive force between them. Due to the high energy in the molecules at. the liquid evaporates when the molecules of it gains more kinetic energy than the attractive force between them. Due to the high energy in the molecules at the surface they escape out which is known as evaporation.


This phenomena occurs at all temperatures but more when the water is heated up. So, the vapor that escaped out were originally the high energy molecules. Due to this the temperature of a liquid cools after evaporation.


And it only occurs from the surface because the surface molecules are only attracted by the lower molecules,there is no any attractive forces above them. And the kinectic energy easily beats that attractive force.
The theory suggests that people sometimes have the inability or  unwillingness to react to changes that occur gradually over time.  The name comes from a 19th century theory that if you put a frog  into boiling water it will jump out but if you put it in and let it  heat slowly it will not jump out.


Some of the obvious companies  that have been affected are Blockbuster, General Electric,  Polaroid, Circuit City, various bookstores and publishing  companies.


Also, while some may not know it now but Sony, IBM,  Nabisco, Compaq, GM, Ford, and Chrysler have been affected by this  phenomenon too.

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