Talk:Evaporation

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Evaporation

Has anyone ever fixed "evaporation is when liquid becomes gaseous without being heated to boiling point"? Apparently not. I'll fix it. Dan Hickman (talk) 23:55, 11 December 2007 (UTC) what is the answer then?[reply]

Diffusion vs. convection

Water evaporation is a special case, but an important one. In still air, over still water, a saturated vapor layer would develop immediately above the water. But humid air is less dense than dry air, so this vapor layer would be buoyant and drive convection. An important detail to understand in the case would be, does diffusion or convection dominate in determining the long-term evaporation rate of the water? -69.87.199.175 (talk) 15:08, 28 February 2008 (UTC)[reply]

Needs rephrase

"On average, the molecules do not have enough energy to escape from the liquid, or else the liquid would turn into vapor quickly." -- this is stupid Needs to be rephrased, as in various cases the liquid does turn into vapor more or less "quickly". -- Writtenonsand (talk) 16:03, 24 July 2008 (UTC)[reply]

Done (to my few, two eyes). That segment looked in need of edit to me too, I interpreted it as though they were trying to paint a picture of "what evaporation is in the real world, in contrast to boiling" but they didn't describe "the molecules" enough, and painting a picture doesn't work with too much abstraction. Now it goes "the molecules in a glass of water," which I think paints the picture they were going for a lot better. I also tossed in the word & link to "boil," which was left out and I believe the intended contrast the original author meant to make, that is, I don't think it was mere coincidence that the logical phrase "unless it is boiling" is the 100% perfect catch to the statement... although if the glass of water is very near boiling point, some may precive it's rate of evaporation as "quick" but hopefully it is an easy thing to read past. I'm glad it didn't just delete it, it's a pretty important distinction to make. —Preceding unsigned comment added by 96.18.60.113 (talk) 08:04, 5 December 2008 (UTC)[reply]

Needs reworking

Re: "Three key parts to evaporation are heat, humidity and air movement." 1) Humidity is a key part of the (important) evaporation of water but not of evaporation in general? 2) Surface area is a key part to evaporation? Bill B —Preceding unsigned comment added by 216.69.46.3 (talk) 20:33, 8 September 2008 (UTC)[reply]

Basically agree with Bill B. When there is a gas-liquid interface with two different components (e. g. air and water), the gaseous part will accept the evaporated liquid only until relative humidity reaches 100 %; then condensation will compensate evaporation; in case of external heat source, the change in temperature may modify the gas-to-liquid ratio in the saturated mix, but nothing more. On the other hand, if the gas-liquid system has a single component (e. g. boiling water), the above simply does not make sense; you may evaporate as long as you feed enough energy. Re point 2 - no, surface area is NOT a key point; it might be influent - sorry for the brutal simplification - since a larger area makes evaporation easier, but the key points is the energy input to the system; in my understanding, also humidity and air movement are not key factors in the change of physical state; they are to be taken into account only as long as you refer to natural evaporation from water reservoirs (lakes, sea, etc.).--Ub (talk) 17:09, 9 September 2008 (UTC)[reply]

Looking better into the article. The problem is in chapter 2 : Factors influencing the rate of evaporation. The previous part is quite correctly dealing with evaporation; this one concerns psychrometry. Therefore, the considerations by Bill B and myself are in the wrong place. The idea is to look at the main article (psychrometry) and to arrange this one accordingly. Hope to find the time. --Ub (talk) 18:46, 10 September 2008 (UTC)[reply]

Energy costs of form change

http://www.overclockers.com/index.php?option=com_content&id=4096 this is awesome, someone should definately consider installing a section on the thermal dynamics of the process, and it's exploitation. Very awesome. <span style="fon

evaporation time

this article needs to explain why, after running a dishwasher, plastic or tupperware dishes are commonly still wet long after smooth glass or china dishes are dry. —Preceding unsigned comment added by 70.131.106.2 (talk) 00:34, 30 June 2010 (UTC)[reply]

Remember - heat is the driving force for evaporation. The glass (silica is involved) can "absorb" alot more heat and then evaporate the moisture "quicker" than the other materials mentioned. Dok Uranium (talk) 05:13, 27 March 2011 (UTC)[reply]

Factors affecting evaporation rate

Isn't viscosity of the liquid a factor whereby there is less evaporation from more viscous liquids? - perhaps more so than density? Is there an expert who can advise on this? Eeno11 (talk) 15:14, 6 September 2011 (UTC)[reply]

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