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Differences between evaporation and boiling?


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June 16, 2012 9:05AM

Evaporation of a liquid can take place at the interface of the liquid with a gas phase,

and the liquid does not need to be saturated (at its boiling temperature).

In boiling evaporation takes place at the interface of the liquid and the solid surface that is providing the heat for the process. The heating surface requires to be at a

temperature above the liquids boiling temperature to produce the heat transfer, and

the liquid gets heated some degrees above its boiling temperature at least in about

a small film over the heating surface called superheated thermal layer, where bubbles

are formed in case of nucleate boiling. Higher heating surface temperature can produce what is called film boiling where the liquid doesn't touch the heating surface

at all.