# Questions tagged [condensation]

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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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### 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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### Gas and Vapour liquefaction

I am a bit confuse in the first statement. I think the statement is implying vapour as 'former' and gas as 'latter'. Am I correct here? But gas can be liqufied with pressure alone below the critical ...
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### Why doesn't the windshield fog up where my kid drew on it with her fingers?

A few weeks ago the inside of my car windshield was fogged up and my older kid used her finger to draw a face in the condensation. Weeks later, the windshield fogged up again, and the face became ...
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1 vote
81 views

### Enthalpy and entropy at phase transition

The second law of thermodynamics states, that entropy (of the universe) always increases. Entropy can, however, be (locally) reduced when energy is provided. At the phase transition from a relatively ...
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### Why $|H_1(\Sigma,\mathbb{Z}_N)|$ can be interpreted as an 1+1d $\mathbb{Z}_2$ gauge theory?

I am reading the article https://arxiv.org/abs/2204.02407, and I am struggling with the definition of a condensation defect, which is given by \begin{align} S(\Sigma)=\frac{1}{\sqrt{|H_1(\Sigma,\...
1 vote
396 views

### Why does dew only fall on horizontal surfaces?

I noticed that dew only falls on horizontal surfaces, while vertical surfaces remain dry. But dew is the condensation of water vapor contained in the air. And for the condensation process, the ...
1 vote
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### Why is condensation point of water same temperature as boiling point?

I am a complete layman and I read somewhere that the condensation point temperature of water is 100°C, same as boiling point temperature. Thinking intuitively, this doesn't make sense to me. Doesn't ...
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### Photon radiation from condensing water

Does water vapor generate electromagnetic radiation/photons when it condenses into water droplets? I know that gas water molecules need a condensation particle to combine into water droplets. A pair ...
174 views

### Condensation on the side of a cloud chamber

I'm trying to build a cloud chamber using a peltier thermoelectric cooler. So far, I've managed to detect some particles, but their trails are very weak (I've used a high voltage generator, about 4kV, ...
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### What can cause this condensation pattern in a window's glass?

What can cause a condensation pattern like this one: in a kitchen's window? Found early in the morning. Adjacent windows had an homogeneous condensation "pattern" all over the surface. ...
189 views

### Condensation on Mirror

When taking a hot shower I notice that moisture forms on the surface of my mirror. Mirrors are insulators so why does water vapour condense on the mirror? I've seen explanations that state that when ...
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### What does it mean by "condensation" of anyons?

My question is motivated from the paper Boundary degeneracy of topological order by Juven Wang and Xiao Gang Wen. Consider a (2+1)D system with boundary, described by abelian Chern-Simons theory. Due ...
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### Why condensation nuclei is required for condensation and formation of clouds?

Why condensation nuclei is required for condensation and formation of clouds? What is the physics behind it? Can you please explain it intuitively? Thank you.
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### Do bubbles of humid air condense when bubbled up through water?

I'm working with an ultrasonic humidifier that bubbles the humid air produced through water. I'm wondering if the humid bubbles condense into the surrounding water. Does this happen?
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### Can you go from a gas to a liquid without condensating through supercritical fluids?

If you were to take a gas like co2 and then heat it up and pressurize it in a specific way, would it theoretically be possible to turn the gas to liquid without using condensation? This would be hard ...
1 vote
104 views

### Calculating amount of water mass condensated when cooling below the dew point temperature [closed]

I've been given the following question: Calculate the dew point temperature of a 60% humid air at $30^oC$. How much water mass wil condensate out of 1 $m^3$ of such air when the temperature is ...
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### Can someone explain this condensation pattern?

What are the mechanics behind the formation of these patterns? Why do they bear visual semblance to results from the Cahn–Hilliard theory of phase separation?
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### How can plots showing the mixing line for Schmidt-Appleman criterion (for aircraft contrail formation modeling) show liquid water below triple point?

In trying to understand the Schmidt-Appleman criterion for contrail formation. There is one aspect that I cannot make sense of. In many papers that describe the criterion they include a plot as shown ...
1 vote
102 views

### Is there any relation between condensation and light?

Ok, I realise the question title is kind of stupid. But I don't really know how to summarize it in one line as it's quite a weird, specific situation. I have a lamp beside my bed on a shelf where I ...
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### Why my glass spects or windows becone blurr in winter i.e cold weather due to my breath but NOT in summer i.e hot weather?and why disappear after?

I noticed than when I blow up on my spects it get blurr as water vapor condense onmy spects, but after some time it dissappear! How? If water vapor at first place loose heat to my spects as my spects ...
1 vote
20 views

I was asked today if non-condensable gases were introduced into a pipeline would it affect the condensing temperature of the steam. For example 0.5 bar steam's saturation temperature is 81.3C if I had ...
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### Does increasing dynamic pressure of moist air increase condensation?

In a pressure cooker, increasing static pressure causes evaporation of water to be less thermodynamically favorable, and increases the rate of condensation of water. This is because water molecules ...
1 vote
150 views

### Superconducting gap function vs condensation energy

Within BCS mean-field theory, what is the relationship between the superconducting gap function (or the superconducting order parameter $\Delta(k)$) and the condensation energy (the energy gained by ...
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### Do antiparticles have their own Fermi surface?

I am trying to understand Fig. 1 of this paper, which shows a quark-antiquark pair forming in a model of QCD with chemical potential: Is the implication that antiquarks have their own Fermi surface, ...
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### Entropy change of the environment during water condensation

When water vapor condenses, the entropy of the water decreases, since $\Delta S=\int{\frac{dQ}{T}}=\frac{mL}{T}$ and $L<0$. Since this process is reversible, the environment must have an entropy ...
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### Why don't clouds gradually evaporate and never come down as rain?

Clouds are present in the troposphere . So the radiation from the Sun first needs to pass this layer of the atmosphere to come down which means that the clouds above are constantly being radiated from ...
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### Which quarks can form vacuum condensates?

I faintly remember the rule of thumb that only the up, down and strange quarks can form condensates because their mass is below the QCD scale $\Lambda_\text{QCD}$. But why is that? Where‘s the ...
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### What is pion condensation (or hadron condensation in general)?

I found some references, for instance here and here, but I still don't really understand the concept of why it happens, or why it's interesting. In particular, I'd like to know: What is hadron ...
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### Mass term in chiral lagrangian and chiral lagrangian

Mesons in chiral lagrangian are described by the chiral action $U = e^{2i\pi^a T^a/f_\pi}$, \mathcal{L}_{chiral} = \frac{f_\pi^2}{4} \text{Tr} \left( \partial^\mu U^\dagger \...
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### In a sealed chamber, can a vapor be heated enough, that the pressure increases enough, to condense to liquid?

Assuming a sealed chamber, containing a vapor, where volume is constant: Given that the ideal-gas law states $PV = nRT$, if heat is added to an ideal-gas, the pressure will increase as a function of ...
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### Will water in vacuum stop boiling?

Will water in vacuum chamber (low pressure chamber(around 0.02 atm)) stop boiling when the remaining air gets saturated? Or if the walls of the chamber are cold enough the water vapor condensates and ...
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### Lack of condensation nearby tile crack

I've noticed that whenever someone takes a hot shower in my bathroom, a specific crack in the tiles of my wall shows a pattern in the condensation, more specifically, a region of about 1cm around the ...
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### Superfluid condensate wave function

I am reading Girvin's Modern Condensed Matter Physics and I have a question about the off-diagonal long-range order (ODLRO). In chapter 18.1, he starts from \begin{align} \rho(\vec{r},\vec{r}') = \...
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### Why does mist on glasses disappear when you go back outside in freezing weather?

This evening after a walk in the cold weather, about -5 degree Celsius, my glasses were misting up when I got back into the warm house, about +20 degree Celsius. However, shortly after I went outside ...
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### Why adding fan to dry cabinet not improve dry performance? [closed]

My dry cabinet is basically rubber sealed cabinet with peltier module to condense moisture and drain it out. The drying process run quit slow from ambient humidity around 50% to 70% it take about 3 ...
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### Why liquids evaporate completely when heated at their boiling points?

I'm confused about why the boiling of liquids happen. The boiling point of a liquid is defined as the temperature in which it's vapor pressure is equal to the pressure of the gas above the liquid( for ...
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### Condensation of saturated vapor on subcooled droplet

Consider the process of condensation of vapor on falling subcooled droplet in the stagnant saturated vapor (neglect the vapor drag on droplet). What can be said about the relation between the droplet ...
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### How is the rate of water vapor condensate formation related to Relative Humidity, Temperature difference and any other relevant parameters?

I do not mean to know how they vary (inversly or directly), I need to know if there is a function relation for the rate of condensate formation.
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### Vapour pressure at the steady state

I came across a question today about vapour pressure, it was as follows : $2$ flasks $X$ and $Y$, each containing liquid water, joined by a tube connecting their mouths (no vapour could escape) having ...
60 views

### How to make water condensate in a specific spot in a closed container? [closed]

I plan on making a large closed terrarium with a dry area and a wet area. How do I make sure that the evaporating water from the wet area does not condense into the dry area? I have found little to no ...
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### How to control dew condensation when shooting tracks in a diffusion fog box?

I got dry ice, so I made a diffusion fog and tried to shoot the track. So I created a diffusion fog box with the following steps: I prepared a circular plastic container with a radius of 6 cm. Next, ...
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### Why is $pV=nRT$ not applicable to a water-steam cylinder system?

A cylinder, with a weightless piston, has an internal diameter of $0.24 m$. The cylinder contains water and steam at $100 C$. It is situated in a constant temperature bath at $100 C$, Figure $2.1$. ...
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### Why is my window condensation pattern like this?

There is a condensation-free area that is shaped like $3/4$ of a bell curve. I’m guessing warm air is leaking to the inside, on the bottom, below crest, and also adhering to the edges, preventing ...
158 views

### How does a shower contribute to the humidity inside a bathroom?

I would like to know the exact process behind the humidity in a bathroom increasing due to a hot/cold shower.
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### How do we determine the flow regime during condensation without knowing the Reynolds number?

Condensation occurs in the mixed flow regime of a condensate film on a flat vertical plate. How does one determine the flow regime during condensation without knowing the Reynolds number? I know that ...
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