Condensation Definition and 141 Threads

I was studying the principles of air conditioning and came across some questions. In an air conditioner, the refrigerant absorbs heat while evaporating indoors, thereby lowering the temperature, and releases heat while condensing outdoors, thereby raising the temperature. According to the second...

Hello, everyone: I'm trying to use the PC-SAFT (Perturbed-Chain Statistical Associating Fluid Theory) method to calculate the bubble point and dew point pressures of hydrocarbon mixtures, and subsequently plot the PT phase envelope. My calculations for bubble pressure match the experimental data...

So basically if I have a closed container with a valve, and inside the container there is water. Now i heat the container and boil the water. The valve is open so steam escapes form there. I now close the valve and cool the container causing the steam to condense inside. Inside the container is...

I have a situation that I cannot explain so I need the assistance of someone with a good understanding of thermodynamics. I have 36 AC to DC power supplies located in an equipment rack. These power supplies are failing after some time. The failures appear to be moisture related. We put...

I think the picture says it all! As the droplets of condensation reached a certain size they begin to run down the plastic sheet, but rather than just running straight down, they veer off to the left or right. Most of the tracks are at fairly much parallel, with some exceptions, and the pattern...

In a normal aircond system using flexible airduct, assume airflow with temperature & humidity conditions (Tdry=23°C; Tdew=13.4°C; RH=55% ) go through a bended flexible airduct where air turbulence is formed: 1. Can condensation happens at the bended flexible airduct due to air turbulence? 2...

if we assume each photon of light as a very very light piece of matter (by famous E = mc^2 and then: m = E / c^2) and sum up all photons that have been made from the creation time of a galaxy (also considering limitation of speed of light) and also photons that accidentally passing throw that...

I don't really know how to begin. I've done alkylations by having two of the same compounds react with each other e.g. two aldehydes but never started out with dimethyl malonate. I was thinking I need 1,4 dibromobutane to form the cyclopentane ring but apart from that I'm clueless

For finding n, I believe that directly applying the above formula gives the results. But I am confused whether I have to put the value of given temperature T = 100K or the actual temperature Tc for Rb-87 at which BE Condensation occurs (i.e. 100 nK, which I got from a quick Google search)? Or do...

According to me 4 products will be formed with a double bond in each of them.So total no. of stereoisomers will be=##4×2^1=8##.First product will be formed due self aldol in acetaldehyde.Second will be formed due to self aldol in Propanaldehyde.And the other two will be formed due to mixed...

S(t)= Hi all! Μy attempt to solve it: I'm stuck here. An opinion ? Thanks.

Hello all, I'm having problems with my compressed air system. In the factory have some clean rooms with temperature are maintained around 23°C. The outside of clean rooms are normal condition (around 32°C). When i checked some air supply points outside. There were no water in compressed air. But...

Context: Small living room, Moderate amount of humidity if the room doesn't get ventilation but is cold outside. Question: If I use some object that can stay in a cold temperature enough to cause condensation (like having a cold beer sitting for a while) and remove the condensed liquid every...

Homework Statement If you have a heat exchanger with a cooling fluid and a fluid that condenses, and the fluid condenses over the entire heat exchanger i.e. its temperature is constant. How can one make a heat balance in such a case, when dT is 0 for the condensing fluid but not the other? i.e...

I have uvex stealth anti-fog chemistry goggles, and in lab the lenses build up with dew. It becomes so bad that I can't see and I have to regularly exit the lab every 15 minutes to wipe them off. I sweat when in the lab, so I'm not sure if that's why . There's no fog, just pure dew drop...

Hello all, I am not sure my question will totally make sense for those of you who now this topic well but as I am new to it I hope I can be forgiven. My problem is to work out how much water will condensate as a stream of moist air is expanded through a turbine. So far I was using Antoine's...

Is the crossed aldol condensation of acetone and ethyl methyl ketone possible?

I understand that condensation occurs when water (in gas form) looses energy and becomes liquid. What I don't understand why some surface is needed to form a liquid water

Hello! I'm trying to simulate a one dimensional time independent BEC, I hope this is the right place to ask for help. First of all, here's my code in Python. import sys import numpy as np import matplotlib.pyplot as plt if len(sys.argv) == 1: niter = 100 elif len(sys.argv) == 2: niter...

What I want to be clarified in this thread is about condensation of steam at constant pressure. Suppose Suppose an enclosed volume of size 1 m³ and it's filled with steam at 100°C and 1 barA pressure. Now, the container is connected to a chamber filled with dry air in such a way that the...

Hi guys! My question is about the heat sinks (cold side) used in some dehumidifiers. It appears that thick, well spaced fins are used, as opposed to a larger number of thin fins, which I would expect to provide better heat transfer. Am I right in assuming that this is to allow space for...

Homework Statement I'm stuck on part (c) of this question. Homework Equations $$T\frac{d}{dT}\bigg(\frac{L}{T}\bigg) \equiv \frac{dL}{dT} - \frac{L}{T}.$$ Clausius-Clapeyron equation: $$ \frac{dp}{dT} = \frac{L}{T\Delta V} \approx \frac{L}{TV_{vap}}.$$ The Attempt at a Solution My approach...

In section 7.1 of his statistical mechanics, Pathria derives the formula ## N_e=V\frac{(2\pi m k T)^{\frac 3 2}}{h^3}g_{\frac 3 2}(z) ## where ## \displaystyle g_{\frac 3 2}(z)=\sum_{l=1}^\infty \frac{z^l}{l^{\frac 3 2}} ## and ## z=e^{\frac \mu {kT}} ##. This formula gives the number of...

I would like to recycle a source of used water at work. The water is contaminated with an acid solution and other chemicals used in a powdercoating process. My question is -- if I were to evaporate the water and then turn it back to condensate, would the water be pure? or would the acid and...

I have a glass vessel with a cooling jacket which previously had cold water running through it. However now it is disconnected from the pump and the jacket is empty, and there is condensation in the jacket from the little water that was left in there. How can I get rid of this condensation...

When I leave a closed half full bottle of water overnight, the next morning I find condensation on the inside walls of the bottle BUT! Only where sun light has reached it! I thought this was widely known and easy to explain, but I've been looking on the Internet for a while and haven't found a...

Hi, I was given the following question: Show that Bose condensation does not occur in 2D. Hint: The integral you will get when you write the formula for N is doable in elementary functions. You should find that that N ∝ ln(1 − e βµ). I do indeed find that N ∝ ln(1/(1 − e βµ)) ∝ ln(1 − e βµ)...

I have a similar question as others but I felt wrong taking over their threads. The project is an casing for electronics that will be outside all year around. Built out of metal. This means rain, sun, snow. -20c to +35c. The electronics inside works only in 0c-45c and 10%-80% humidity. I want...

Homework Statement On a winter day, suppose your breath has a temperature of 30°C and a dew point of 28°C,and it mixes with the ambient air of temperature –10°C and a dew point of –11°C. Will you see your breath? Assume you are at sea level, and that your breath and the environment mix in...

Greetings, I'm preparing for an experiment on a modified Tesla Turbine design and will need to condense the exhaust steam rapidly in order to measure the pounds per hour of saturated steam that goes through the system. Incoming steam could be as high as 90 PSI through a 1" pipe. As the turbine...

Hello, I am by far not very firmiliar with physics nor engineering. I had an idea a couple years ago involving the replacement of the propane in hot air balloons with hydrogen gas as the fuel to burned to provide the heat to lift the balloon. One thing I didn't realize back then was that...

Hi, I have comes across bits and pieces of what I want to do online but haven't gotten the answers I need so I'm reaching out for help. This is my first post here. I'm planning to create a box to house an AV receiver outdoors (late spring/summer/early fall only in Maine) inside a screen...

Scenario A: An icicle on the eaves of Uncle Ivan’s dacha in far off Verkhoyansk vaporizes a number of water vapor molecules at an ambient temperature of -80°C. Over the succeeding months, one of these molecules makes its random way to the surface of a cloud droplet over Ouagadougou. Along the...

I had to installed some IP bullet cameras in some PVC pipe on a Hopper dredge to protect it from the salt water spray. They are outdoor cameras but they are made out of aluminum and they will rust if left unprotected. I sealed them in the pvc and used a cgb from the wire as well as sealant on...

Hello What are some method or references to consider BECs or atom lasers in finite temperatures with Gross-Pitaevskii equation? There is quantum mechanical approach but I want a mean field approach which considers thermal or quantum noises too. If possible, introduce some references. Thank you...

So I'm having an argument.. and I just can't explain this in a way that manages to be convincing. So there are two pots in question: One is a special pot made out of a supposedly special material, and has a very tight lid. Once the lid is on, I observe that if you simply poured water on the top...

Homework Statement Explain the conditions under which Bose-Einstein condensation occurs and show this happens for density ##\rho \equiv N/V > \rho_C(T)##, where $$\rho_C(T) = A(kT)^{3/2} \int_0^{\infty} \frac{x^{1/2}}{ e^x − 1} dx .$$ Suppose the energy of the particles on the lattice is now...

I am a retired climatologist, not a physicist. I am seeking the help of physicists to resolve a matter that has always puzzled me. I shall try to list my reasoning in what appears to me to be a logical order. I will number my statements so that you may isolate my errors more easily. 1. When...

Homework Statement [/B] Consider a gas of N weakly interacting bosons trapped in a 3d harmonic potential ##V = \frac{1}{2}mw^2 (x^2 + y^2 + z^2)##. The single particle quantum states have energies ##\epsilon = \hbar w (n_x + n_y + n_z + 3/2)##. Calculate the total number of quantum states...

Homework Statement In a typical aldol condensation (say 2 aldehydes reacted with NaOH, water, and under heated conditions) why is hydroxide considered a good leaving group in the final step? Homework Equations NA The Attempt at a Solution I drew out a mechanism with an aldehyde and a ketone...

Hi I have been thinking about this idea and i'we come to the conclusion that i need to discuss this with someone who has a better understanding of physics than i have. First off, let me help you visualize it: You put pieces of hardware that generate heat inside of a container, the container...

It can be easily proved that Bose Einstein condensation can be got in infinite 2D. But what about finite 2D with extreme large "Volume" L^2 ?

Homework Statement Total temperature of mixture= 600 K, mass fraction of vapour to mass of total mixture=0.01 Homework Equations Ideal gas law, Mach area relations, Rankine-hugoniot equations The Attempt at a Solution Applied Clausis-Clapeyron relation to find vapour pressure, Then found...

Velocity of any flowing vapour reduces as it condenses. Can any of you please suggest the equation to find the reduction in velocity of a vapour as it condense. Thanks in advance.

I'm not sure if this is the right section... But Assume you have a medium sized box (about as big as a large desktop computer) inside a room. And inside the box there is a jar of water that is significantly colder than the outside temperature. How would you prevent water condensation...

Homework Statement I'm really confused about this concept. I know that when you evaporate a liquid, heavier isotopes stay behind because it's easier to evaporate lighter isotopes. This is intuitive to me. I'm confused on the case of condensation because I'm reading two things that seem...

Hi, my course just provided an introduction to Bose-Einstein Condensation. I was told that this phenomenon occurs when the temperature of Bosons go under a certain critical temperature T_{c} > 0K. At absolute zero, all the Bosons go into the condensed phase. However, at temperatures...

Homework Statement http://i.minus.com/jFwk7CteHDISN.png Homework Equations Heat of condensation = -(heat of vaporization) The Attempt at a Solution Okay, so I tried to find the heat of vaporization. Then I to took the negative of it since the process is condensation, and energy is being...

1. "Students were instructed to mix the benzaldehyde and acetone starting materials in their conical vials before adding the ethanolic sodium hydroxide solution. Why was this essential to the success of the reaction? What would have been the most likely product formed if the sodium hydroxide...

Hi there, I was wondering that if you took anything, let's use water as an example, evaporated it into a gas, then heated it until it became a plasma, (I don't know or care whether water molecules can be turned into a plasma, that's not the point,) could it be turned back into a liquid/solid? I...