Changes

==Etymology==

==Etymology==

[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Latin evaporatus, past participle of evaporare, from e- + vapor steam, vapor

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Latin evaporatus, past participle of evaporare, from e- + vapor steam, vapor

*Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]

*Date: [https://www.wikipedia.org/wiki/15th_Century 15th century]

==Definitions==

==Definitions==

*1 a : to [[convert]] into [[vapor]]; also : to dissipate or draw off in vapor or fumes  

*1 a : to [[convert]] into [[vapor]]; also : to dissipate or draw off in vapor or fumes  

Evaporation is a type of [[phase]] [[transition]]; it is the [[process]] by which [[molecules]] in a [[liquid]] state (e.g. [[water]]) [[spontaneously]] become [[gaseous]] (e.g. water vapor). Generally, evaporation can be seen by the [[gradual]] disappearance of a [[liquid]] from a substance when exposed to a significant volume of [[gas]]. Vaporization and evaporation however, are not entirely the same processes.  

Evaporation is a type of [[phase]] [[transition]]; it is the [[process]] by which [[molecules]] in a [[liquid]] state (e.g. [[water]]) [[spontaneously]] become [[gaseous]] (e.g. water vapor). Generally, evaporation can be seen by the [[gradual]] disappearance of a [[liquid]] from a substance when exposed to a significant volume of [[gas]]. Vaporization and evaporation however, are not entirely the same processes.  

On [[average]], the [[molecules]] in a glass of [[water]] do not have enough [[heat]] [[energy]] to escape from the [[liquid]]. With sufficient heat, the liquid would turn into vapor quickly (see [http://en.wikipedia.org/wiki/Boiling_point boiling point]). When the [[molecules]] collide, they [[transfer]] [[energy]] to each other in varying [[degrees]], based on how they collide. Sometimes the [[transfer]] is so one-sided for a [[molecule]] near the [[surface]] that it ends up with enough [[energy]] to [[escape]].

On [[average]], the [[molecules]] in a glass of [[water]] do not have enough [[heat]] [[energy]] to escape from the [[liquid]]. With sufficient heat, the liquid would turn into vapor quickly (see [https://en.wikipedia.org/wiki/Boiling_point boiling point]). When the [[molecules]] collide, they [[transfer]] [[energy]] to each other in varying [[degrees]], based on how they collide. Sometimes the [[transfer]] is so one-sided for a [[molecule]] near the [[surface]] that it ends up with enough [[energy]] to [[escape]].

[[Liquid]]s that do not evaporate visibly at a given [[temperature]] in a given [[gas]] (e.g. cooking oil at room [[temperature]]) have [[molecules]] that do not tend to [[transfer]] [[energy]] to each other in a [[pattern]] sufficient to frequently give a [[molecule]] the heat [[energy]] [[necessary]] to turn into vapor. However, these liquids are evaporating. It is just that the [[process]] is much slower and thus significantly less visible.

[[Liquid]]s that do not evaporate visibly at a given [[temperature]] in a given [[gas]] (e.g. cooking oil at room [[temperature]]) have [[molecules]] that do not tend to [[transfer]] [[energy]] to each other in a [[pattern]] sufficient to frequently give a [[molecule]] the heat [[energy]] [[necessary]] to turn into vapor. However, these liquids are evaporating. It is just that the [[process]] is much slower and thus significantly less visible.

Evaporation is an [[essential]] part of the [http://en.wikipedia.org/wiki/Water_cycle water cycle]. [[Solar]] [[energy]] drives evaporation of water from [[oceans]], [[lakes]], moisture in the [[soil]], and other sources of [[water]]. In [http://en.wikipedia.org/wiki/Hydrology hydrology], evaporation and [http://en.wikipedia.org/wiki/Transpiration transpiration] (which involves evaporation within [[plant]] [http://en.wikipedia.org/wiki/Stomata stomata]) are collectively termed [http://en.wikipedia.org/wiki/Evapotranspiration evapotranspiration]. Evaporation is caused when [[water]] is exposed to [[air]] and the [[liquid]] [[molecules]] turn into water vapor which rises up and forms clouds.[http://en.wikipedia.org/wiki/Evaporation]

Evaporation is an [[essential]] part of the [https://en.wikipedia.org/wiki/Water_cycle water cycle]. [[Solar]] [[energy]] drives evaporation of water from [[oceans]], [[lakes]], moisture in the [[soil]], and other sources of [[water]]. In [https://en.wikipedia.org/wiki/Hydrology hydrology], evaporation and [https://en.wikipedia.org/wiki/Transpiration transpiration] (which involves evaporation within [[plant]] [https://en.wikipedia.org/wiki/Stomata stomata]) are collectively termed [https://en.wikipedia.org/wiki/Evapotranspiration evapotranspiration]. Evaporation is caused when [[water]] is exposed to [[air]] and the [[liquid]] [[molecules]] turn into water vapor which rises up and forms clouds.[https://en.wikipedia.org/wiki/Evaporation]

[[Category: Physics]]

[[Category: Physics]]