102,819
edits
Changes
Created page with 'File:lighterstill.jpgright|frame ==Etymology== [http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENG...'
[[File:lighterstill.jpg]][[File:Shoreline_salt_evaporation.jpg|right|frame]]
==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
*Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : to [[convert]] into [[vapor]]; also : to dissipate or draw off in vapor or fumes
:b : to deposit (as a metal) in the [[form]] of a film by sublimation
*2 a : to expel [[moisture]] from
:b : expel <evaporate [[electrons]] from a hot wire>
==Description==
'''Evaporation''' is a [[type]] of vaporization of a [[liquid]], that occurs only on the [[surface]] of a liquid. The other type of vaporization is boiling, that instead occurs on the entire [[mass]] of the [[liquid]]. Evaporation is also part of the [[water]] [[cycle]].
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]].
[[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]
[[Category: Physics]]
==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
*Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : to [[convert]] into [[vapor]]; also : to dissipate or draw off in vapor or fumes
:b : to deposit (as a metal) in the [[form]] of a film by sublimation
*2 a : to expel [[moisture]] from
:b : expel <evaporate [[electrons]] from a hot wire>
==Description==
'''Evaporation''' is a [[type]] of vaporization of a [[liquid]], that occurs only on the [[surface]] of a liquid. The other type of vaporization is boiling, that instead occurs on the entire [[mass]] of the [[liquid]]. Evaporation is also part of the [[water]] [[cycle]].
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]].
[[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]
[[Category: Physics]]