Questions tagged [evaporation]
The process of a liquid changing to a gaseous state
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Temperature of a resting glass of water
It’s summer and summers have become more and more hot&humid lately. This got me curious about the dew point and then wet bulb temperatures, both for scientific and (maybe, someday in the future) ...
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Why should the rate of evaporation of liquids depend upon the rate at which the molecules strike the surface?
This paper says:
The development of the kinetic theory of gases led to the conclusion
that the maximum rate at a particular temperature would be given by
the rate at which molecules strike the ...
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Energy Benefits of Using Windows Vacuums to Remove Water That Otherwise Evaporates and Absorbs Energy
I've been using a new window vac and pondering its effect on the temperature in the house - and there seems nothing written about this that I can find. Plainly when the water evaporates energy is ...
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During evaporation, why would we expect temperature of the gas at the interface to be lower than the temperature of the liquid?
This paper says that, from the kinetic theory of gases, we expect temperature of the gas at the interface to be lower than the temperature of the liquid. Could the experts here please explain it?
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Is there any study of the temperature gradient at the surface of a liquid?
My tiny brain expects liquids to be cooler at the surface due to evaporation. However, I couldn't find any experimental evidence for it.
Is there any study of the temperature gradient at the surface ...
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What is the mechanism of sublimation?
Evaporation can be easily understood from the Maxwell-Boltzamann distribution. There is always a finite number of high speed atoms/molecules, however small, which have the energy to leave.
Solids do ...
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Center of mass thought experiment
Suppose we have a cylindrical container which contains water filled up to the brim. We now consider gravity free conditions. Then we shine some light on the water container from all the directions (...
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Drying polymers (e.g. FDM 3D printing filaments)
As far as I understand, a polymer absorb some moisture and amount of (maximum) moisture that can be absorbed depends on its type (PLA ~1%, ABS? ~10%). Both simple commercial filament dryers and drying ...
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Earthen Pots made in summers vs winters
I've heard my parents saying that the water in earthen pots that are made in winters cools more than a pots that are made in summers. Is this true according to physics? I understand the process of ...
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How to obtain this expression of the Reynolds number for evaporating falling films?
The Reynolds number for evaporating falling films on a vertical plate is expressed as
$$\mathrm{Re}=\frac{4\Gamma}{\mu}$$
but what are the steps that would take me from the common formula for the ...
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How to dry a cup?
If you wash a cup and shake it out thoroughly so there are no longer any drops of water large enough to move, it seems like the cup ought to dry faster by putting it right side up, since all drying ...
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Flux pinning upon a ultracold vapor of neutral atoms
Suppose I have a mixture of two different atoms A and B, both with an even but different number of electrons which fully fill both of their outermost shells. The two are different elements.
Now, ...
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Why do coloured water droplets form rings upon drying up?
While cleaning my fountain pen, I spilled some water on the table. The water drops had some ink dissolved in them. When these drops dried up, the deposited pigment density was visibly much higher near ...
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What's the percentage/relationship of evaporative cooling applied to the liquid by an evaporating/expanding gas?
The example below is simply to provide illustration of the problem. This isn't a homework question. I'm trying to visualize the relationship between liquid and gas at the boundary and I'd appreciate ...
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Why aren't positive ions emitted at the same rate as electrons via thermionic emission?
The Effective Work Functions of the Elements are very similar for removing an electron or a positive ion, e.g. about 4.5 eV for Tungsten.
If their work functions are similar, why aren't positive ions ...
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