All Questions
Tagged with water evaporation
113
questions
0
votes
0
answers
36
views
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) ...
- 101
0
votes
0
answers
26
views
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 ...
- 1
0
votes
0
answers
22
views
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 ...
- 101
6
votes
2
answers
381
views
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 ...
- 169
1
vote
1
answer
67
views
Water Vapour and Liquid Water Interactions
It is known that a certain number of particles in a sample of water have enough kinetic energy to ‘escape’ from their intermolecular bonds and into the gas phase. But what is stopping these water ...
- 11
3
votes
4
answers
493
views
What is the physical reason for why hot air holds more water vapour, and how does this relate to saturation vapour pressure?
It is said that hot air holds more water vapour.
I guess this means that the saturation vapour pressure of water in air increases with temperature. Is this correct?
How can one derive this result? ...
- 357
2
votes
1
answer
64
views
How has Earth's atmospheric water been in previous eras and periods?
How has partial pressure and net amount of water vapor and colloidal water been in previous eras and periods on Earth?
- 966
1
vote
1
answer
374
views
Why does a small puddle of water evaporate faster at the edges than the center?
I have read that ceiling tile stains and coffee ring stains are darker on the edges than the center because the puddles evaporate fastest at the point of contact between the surface, air, and water ...
- 73
1
vote
1
answer
45
views
I’m trying to humidify my house by evaporating water in a vessel on my wood stove. Will a lidded teakettle produce more or less vapor then a open pot? [closed]
I found a tea kettle that looks very nice on our wood stove but am thinking that using an open pot would be more efficient at humidifying the air due to the larger exposed surface of the water vs ...
- 11
1
vote
0
answers
23
views
When water is evaporated and the particles with a little more energy breaks away, Why do the molecules left have less motion?
From Feynman's Six easy pieces:
Then a molecule leaves it is due to an accidental, extra accumulation of a little bit more than ordinary energy, which it needs if it is to break away from the ...
- 21
1
vote
1
answer
541
views
Steam Produced by Induction Cookers
I had recently noticed that induction cookers produce much more steam than normal gas tops and when I set the setting in the induction cooker to 'steam' it produces ever more steam. I used the same ...
0
votes
0
answers
419
views
Why is the latent heat of vaporization 0 at the critical point?
This is not a homework question.
The critical point of water is $\mathrm{374 \ C}$ and $\mathrm{22.06 \ MPa}$. At the critical point the latent heat of vaporization is $0$ - why?
Assume the water ...
1
vote
1
answer
171
views
How much heat energy is required to bring 1 liter of water to the critical point?
This is not a homework question.
The critical point of water is 374 C and 22.06 MPa. At the critical point the latent heat of vaporization is 0 - why?
Assume the water starts at 100 C.
If you add the ...
2
votes
1
answer
4k
views
How do I calculate rate of water evaporation at various water temps?
I am trying to figure out how many gallons of fresh water will evaporate per hour in a large tank at various water temperatures?
Specifically,
surface area is 250,000 sq ft surface area (500' x 500')
...
- 23
1
vote
2
answers
2k
views
Does it take more energy to evaporate a litre of water in a vacuum, and if so, why?
I got this information and want to know if it is correct and if so, why does it take more energy to evaporate water in a vacuum compared to no vacuum?
Vacuum:
it takes 4200 J/kg to increase the temp ...
- 113