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"वाष्पीकरण" का संशोधनहरू बिचको अन्तर

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[[Image:watervapor cup.jpg|thumb|right|पानीको बाफ; हावा जस्तै भएर नदेखिने भए पनि घामका किरणका ठक्करका कारण देखिन्छ ।]]
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[[Image:watervapor cup.jpg|thumb|right|[[Aerosol]] of microscopic water droplets suspended in the air above a hot tea cup after that water vapor has sufficiently cooled and condensed. [[Gaseous water|Water vapor]] behaves like a [[gas]] and is, thus, invisible, but the [[cloud]]s of condensed water droplets refract and diffuse the sun light and so are visible.]]
 
'''Evaporation''' is a type of [[vaporization]] of a [[liquid]] that occurs only on the [[Interface (chemistry)|surface]] of a liquid. The other type of vaporization is [[boiling]], which, 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 [[molecule]]s in a [[liquid]] [[State of matter|state]] (e.g., [[water]]) spontaneously become [[gas]]eous (e.g., [[water vapor]]). In general, 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. {{Citation needed|reason=For example, substances like [[caesium]], [[francium]], [[gallium]], [[bromine]], [[rubidium]], and [[mercury (element)|mercury]] may vaporize, but they do not evaporate as such.|date=November 2009}}
 
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 [[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.
 
Liquids 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 [[water cycle]]. [[Solar energy]] drives evaporation of water from [[ocean]]s, [[lake]]s, [[soil moisture|moisture]] in the soil, and other sources of water. In [[hydrology]], evaporation and [[transpiration]] (which involves evaporation within [[plant]] [[stomata]]) are collectively termed [[evapotranspiration]]. Evaporation is caused when water is exposed to air and the liquid molecules turn into water vapor, which rises up and forms clouds.
 
== Theory ==
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