Chamber Definition and 243 Threads

A diving chamber is a vessel for human occupation, which may have an entrance that can be sealed to hold an internal pressure significantly higher than ambient pressure, a pressurised gas system to control the internal pressure, and a supply of breathing gas for the occupants.
There are two main functions for diving chambers:

as a simple form of submersible vessel to transport divers underwater and to provide a temporary base and retrieval system in the depths;
as a land, ship or offshore platform-based hyperbaric chamber or system, to artificially reproduce the hyperbaric conditions under the sea. Internal pressures above normal atmospheric pressure are provided for diving-related applications such as saturation diving and diver decompression, and non-diving medical applications such as hyperbaric medicine.

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  1. Conservation

    Creating a Home-made Vacuum Chamber

    Hello all, I was wondering a way to make a simple vacuum chamber with a relatively small volume (probably won't need to be bigger than 300mL at best) from some common materials. I have access to common glassware (beakers, although not sure if they can withstand the pressure), and ideally I...
  2. W

    What would cause sudden change in evaporation chamber behavior?

    Hello all, I use an evaporation chamber at my lab every day. Basically, put some substance in the chamber, close it, bring it down to vacuum, and pump enough current through it to vaporize it where it deposits on a substrate. I've been using 175A to create a deposition rate of about 1...
  3. W

    Why does positron not annihilate sooner in cloud chamber experiment

    Specifically in Carl D Anderson's cloud chamber experiment, the first experiment to prove the existence of the positron, a positron travels through all of these mediums: glass, charged liquid particles, water vapor, and lastly passes through a lead plate. If antimatter is suppose to anihilate...
  4. R

    Wilson Cloud Chamber: Observing Cosmic Particles

    A (Wilson) Cloud Chamber can show the tracks of ionized particles passing through it, typically emanating from outside the chamber and attributed to cosmic rays (more accurately described as cosmic particles). The chamber itself has one or more transparent surfaces, most commonly glass, through...
  5. P

    Angle of attack as a function of Chamber line

    Hi, Simply my question is : How do I calculate the angle of attack as a function of chamber line. where chamber line is given. and how can angle of attack for zero-lifr be calculated? This is not a homework. I can't see it by my eye without knowing the lift coefficient. I hope somebody can...
  6. R

    Pressure vessel exploding within an atmospheric chamber

    I am currently investigating pressure test safety with my current employer. Currently we test pressure vessels inside steel test containers, see attached pdf. At the moment Boyles law is used to calculate the resultant pressure increase inside the steel container if the pressure vessel was to...
  7. S

    Vacuum chamber thickness design

    Vacuum pressure for design of pipe Dear experts, I have a line pipe which internal design pressure is 98 bar,dia is 36: thickness is 13 mm,length is 12 mtr. I want to know that how much vacuum pressure sustain by this line pipe? Regards, Satish patel,
  8. L

    What is the step response of a filling chamber with changing air pressure?

    Homework Statement This is a experimental problem that I am trying to model: I have an air source with constant pressure P connected with a small chamber (cylinder). The chamber has initial internal pressure P_0 and as time t goes, the pressure in the chamber raises to P. So, find the step...
  9. B

    Calculating Temperature Change in Real Gas Isolated Chamber with Changed Volume

    Homework Statement We have a real gas in an isolated chamber. The potential between the molecules is described as ##\phi (r)=\phi _0e^{-(\frac{r}{\sigma})^{2}}##, where ##\phi _0=5\times 10^{-4}eV## and ##\sigma =5 nm##. At 300 K we have ##10^{24}## molecules per ##m^3##. Calculate the...
  10. C

    Have you tried the Cloud Chamber Experiment?

    Has anyone here ever done this experiment? A buddy of mine and I were thinking of setting this up but we had a few questions first. Is it better to use pure isopropyl or pure ethyl alcohol? I have read both from different sources. To conduct this more than once, do you just have to replace...
  11. T

    Airborne particle focusing in heated chamber using thermal emission?

    Greetings PFers, I'm working on a project where micron size metal or plastic particles are carried inside an argon or nitrogen stream at ~1 atm. The particles travel through at 1/4'' ID nylon tube before they enter a chamber where they then travel through a pyrex tube. I have four 4'', 500W...
  12. Russ Edmonds

    My expansion cloud chamber movie

    Hi all, below is a video showing a compilation of many expansions of my Wilson cloud chamber. The tracks shown are mostly alpha and cosmic rays. The chamber uses a rubber bulb from a turkey baster as the expansion piston. The object in the chamber is a cork with a radium paint coated pin. I'm...
  13. W

    Vacuum Chamber Demo: Investigating Temperature & Humidity Changes

    I did a demo for my students, using a simple vacuum pump and a vacuum chamber. I put a burning candle in the vacuum chamber. This generates numerous CCNs (cloud condensation nuclei) (I believe) and perhaps some larger-than-normal CCNs. A cloud forms in the vacuum chamber for a few seconds, then...
  14. U

    How Do You Build a Vacuum Chamber That Can Manipulate Internal Objects?

    I have been interested in constructing a vacuum chamber for quite some time, but I am not completely certain on what the structural specifications need to be so that it can hold up to the immense external pressure. My main motivation for building a chamber like this is in the hope that I will...
  15. C

    What Is the Final Temperature in an Adiabatically Expanded Air Chamber?

    Homework Statement Consider an isolated evacuated chamber. A small adiabatic valve is opened so that the air enters the chamber slowly from the atmosphere. What is the final temperature of the air inside the chamber once it has reached atmospheric pressure? Assume air is an ideal gas with...
  16. S

    UV and harmful gases formation at aging test chamber

    Hello! At work we have an UV aging test chamber that produces around 140 W.m^-2 UVA 15 W.m^-2 UVB and less then 1 W.m^-2 of UVC. The chamber is big, we have to go in and out to collect the items. Is it possible to have ozone formation or other harmful gases inside the chamber?
  17. G

    Gas flow from one chamber to another

    Hi, I don't know a ton of fluid mechanics, and haven't been able to mathematically define this problem, so I was hoping someone might have an idea. The problem I want to solve is the time it takes for gas to flow from one chamber (with finite pressure) to another (vacuum). The problem is...
  18. G

    Strain on NPT thread in high pressure chamber

    Thanks in advance to any help on this: I am working in a combustion lab and we are designing a high pressure tube reactor. My background is only in math and I have never taken a materials or design course before, so I apologize that this is probably a very basic application and a very...
  19. L

    Differential pressures in a chamber, revisited and clarified

    This is a clearer, better drawn, and shorter version of a question I asked a few days ago. I apologize for not initially reducing it to this state - sometimes when reducing a question to its essence I stop too soon! The diagram below shows two cross-sections of an axis-symmetric cylindrical...
  20. T

    Acoustic Resonance Chamber Design- Wine glass shattering

    Greetings PFers, I'm designing a demonstration unit for use in grade schools demonstrating the principle of resonance upon wine glasses (shattering them). I intend to put a wine glass into an acrylic chamber of some geometry, hand the student a microphone and see if they can generate the...
  21. B0b-A

    What has caused this panda-face in a cloud chamber ?

    This image was posted on another forum , maybe someone here may be able to shed some light on the origin of the grinning-panda ... The the cloud chamber does not have an applied magnetic field. The radioactive source is Americium 241 [ from smoke detector ? ]. The duration of the camera...
  22. Crazymechanic

    Can Nested Spheres With Equalized Pressures Prevent Structural Failure?

    Now I am just thinking about pressures and material strengths and I came across a question.To formulate the question I am going to explain a little bit of a thought situation. Normally if you would have a let's say sphere with very thick walls and you would increase pressure of a gas inside...
  23. H

    Design of an Semi-Anechoic chamber

    This is for a anechoic chamber for testing the exhaust noise from a particular engine, it will just be an engine test cell with the dyno in an adjacent room. As the dominant noise from an engine is the engine itself and the exhaust, how would one separate them? also is there any info on where...
  24. A

    Can a high voltage across a chamber ionize a gas?

    Can a high voltage across a chamber ionize a gas? This is for an experiment...thanks guys...
  25. C

    Vacuum chamber air intake problem

    hello, I have build a vacuum chamber out of an acrylic cylinder. I can get down to 50 micron but if I turn off the vacuum motor the chamber does not keep its atmosphere (air getting in) What i did is add a high quality valve between the chamber and motor. Sunk everything in an oil bath...
  26. rkum99

    Ionizing Radiation in a Cloud Chamber

    Hello! I've been doing a lot of research on cloud chambers recently, and I've come up with a quite a few questions on the behavior of certain types of ionizing radiation: 1) For a start, I assume that gamma-rays and X-rays will induce Compton scattering inside the cloud chamber...
  27. S

    Identifying trails in a Cloud Chamber

    I was thinking of making a cloud chamber and have looked at several videos on them. I noticed several different types of trails and was wondering if anyone can identify which particles they belong to i.e. alpha, beta, muon. I'm am particularly interested in Muons and I won't be using any...
  28. A

    Building a hydrostatic pressure chamber

    Hello! I am currently looking into building a small hydrostatic pressure chamber to test the behaviour of a piece of tissue (cartilage) under physiological pressures. The pressure range should be between 5-15 MPa. I need to measure the volume change/deformation of the tissue, so the...
  29. jtbell

    R.I.P. Donald Glaser (inventor of the bubble chamber)

    Donald Glaser, Nobel Winner in Physics, Dies at 86 He invented the bubble chamber in 1952 at the age of 26, while at the University of Michigan. I think I was the last person to get a Ph.D. with the UM bubble chamber group, in 1982. (Glaser left for Berkeley in 1959, long before my time.)
  30. M

    Drip chamber pressure effect effect in fluid administration

    Hi .. I am referring to a a typical IV set administratin of fluids. I am seeing reference in the literature mentioning that bottle height is from the fluid release level to the drip chamber in which you can see some air gap between two level of liquid(call it lower and upper!). According to...
  31. C

    Vacuum chamber for filling bee comb

    New here and very much out of my element being on ANY physics forum but here it goes anyway. I am a beekeeper in S. E. NC. I sell honey from my hives and donate the proceeds through my NC Non-Profit. These proceeds go to chordomafoundation.org. Nearly all beekeepers feed their bees at some...
  32. T

    Cloud Chamber Solvents: Identifying Mystery Liquid

    I recently observed a liquid pooling at the bottom of my cloud chamber. It was purple in color and rather odd. It was certainly flammable, which leads me to believe that it was a result of solventing between the supersaturated alcohol and the canned air used for my chamber...
  33. C

    Calculating Velocity for Pressure Testing Chamber Design

    Hey, I am brand new to this Forum, and I am trying to design a pressure testing chamber. The plan is to test a sample cylinder that is fitted with two needle valves and a quick connect fitting for leaks. I want to do this by pressuring it up to 1800 psi with air and putting it in the chamber...
  34. T

    Why Isn't My Cloud Chamber Showing Tracks?

    I was working on my cloud chamber today, and I ran into two problems: A) It's not working :) To be more specific, I used compressed air to get the bottom extremely cold. The structure itself is a small plastic throw away cup, with a sponge with 91% alcohol stuck to the top. The bottom (the open...
  35. T

    Plasma colour in a sputtering chamber

    Hi everyone, my question is: what information can someone get by just looking at the colour of a plasma? I the elements inside the chambers, together with some(few) common impurities. Using the common spontaneous emission formula i can guess what transition emitted light with a particular...
  36. O

    Lifetimes of kaon and lambda baryon in a bubble chamber

    Lifetimes of kaon and lambda particles in a bubble chamber (updated) Statement of the problem: This isn't quite a homework problem. I'm just having trouble with the concepts of this lab. I'm working on a lab report dealing with analysis of bubble chamber photographs of the decay of a kaon...
  37. F

    Chamber design (mufflers). I'm stuck,

    my lonesome have been working on a set of mufflers that don't sound like fecal matter. I am having a difficult time finding just the mufflers (race mufflers). I DO NOT want an entire exhaust system. I do have the capability of fabing up mufflers, I have custom made equal length headers to an x...
  38. U

    Thickness of steel required for a vacuum chamber

    I'm trying to build a vacuum chamber for chemistry purposes. This isn't exactly for school, but it's something I'm doing for fun and it's close enough to a school problem. Anyway, my vacuum chamber will be a prism 24" wide, 18" deep, and 18" in height. It will also have a 8"x6" Plexiglas window...
  39. E

    Cheap Hydrostatic Testing Chamber

    "Cheap" Hydrostatic Testing Chamber As background information, I'm a computer programmer by trade but I want to get into underwater ROVs as a hobby because I need a hobby that doesn't involve sitting in a chair all the time, because Bob Ballard was one of my heros as a child, and because there...
  40. F

    Cloud Chamber Using Peltier Coolers

    Hello All! Does anyone have a good design for a Cloud Chamber using Peltier Coolers? I'm wanting to build a chamber that will be able to pick up cosmic rays/background radiation, that will be a bit more professional than a Tupperware container sitting on dry ice. Does anyone have a good design...
  41. N

    Goal -> Constant Vacuum in a Chamber

    Goal --> Constant Vacuum in a Chamber Im working on a art piece that requires that I keep a constant vacuum in a chamber. I will soon have a pump and the chamber required but i was hoping someone could point me in the direction of a regulator that would hold the vacuum. The piece requires...
  42. T

    Plasma-Based Chamber: Potential for Space Propulsion

    I'm not sure if this goes here or not, it kind of involves a few different disciplines so if it's in the wrong place, please could a moderator move it or let me know where to post it. The idea that I had and am still trying to flesh out, is of a spherical chamber. This chamber is lined with...
  43. C

    How can a bubble chamber be used to identify high energy particle reactions?

    Does anyone know of any sources / good books / websites which explain how to identify decay products of high energy physics reactions? Many thanks
  44. S

    Change of pH in corrosion chamber

    Hi all. New to the forum & 1st post. I've recently been put in charge of using a corrosion chamber (Ascott 450+XP) in my place of work and I've not had much experience using them. We are validating the equipment to BS EN ISO 9227:2006 (pretty much exact same as ASTM B117) using steel...
  45. H

    Superconductor in vacuum chamber - low energy consumption solution?

    Hello all, Superconductors are great, but obviously its tricky to keep them at such a low temperature for extended periods of time. This poses a problem for engineering applications. What about the feasibility of cooling the superconductor, then placing the material in a vacuum chamber...
  46. E

    Optics question-vacuum chamber for Ellipsometry

    I have shown a picture of our current ellipsometry setup. The sample is placed in the center. Polarized light comes in from the left barrel, reflects off the sample, and enters the barrel on the right. What I'm looking to build is a cover/chamber this that covers the sample but does not affect...
  47. E

    Optics question-Materials for vacuum chamber viewing ports

    Hi guys, I am interested in designing a chamber that is either purged with nitrogen gas or vacuum sealed that encloses a thin film sample. The method of analysis is via ellipsometry. (My knowledge of optics is extremely limited but know that ellipsometry measures some shift in polarization...
  48. P

    Forces on a cylindrical vacuum chamber

    If a cylindrical vacuum chamber's diameter is increased, then the inward force on the two ends will increase because the area is increased. However, if the length of the chamber is increased, while keeping diameter constant, will that increase the net inward force on the chamber? Or does...
  49. N

    Anechoic chamber, RAM, and faradays cage

    Hi, I was reading about anechoic chambers for performing tests of RF equipment, and read that they are usually screened rooms, built as a Faradays cage (Grounded, closed metal structure) in order to block radiation from the outside, and stop radiation escaping. But also they coat the...
  50. N

    Vacuum Chamber: How Long Will It Maintain Pressure?

    The syringe' plunger is in a fully retracted position (non-vacuum state) and is then connected to the tube forming an airtight seal. Then the valve to the vacuum chamber, having 29.9 Hg of vacuum, is opened. I am fairly, certain that the plunger in the syringe will move to its forward most...
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