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Question 1

-2votes

0answers

67views

Twistorr Agilent 74fs Vent Valve + Controller (not venting fully)

I am using a Twistorr Agilent 74fs Turbo with a vent valve kit attached to it (https://www.agilent.com/store/en_US/Prod-9699844/9699844) as a part of a system that cools a coldhead to ~1K. This should ...

thewholesquare

13

askedNov 14 at 17:54

Question 2

3votes

3answers

2kviews

Will gases contained inside a box eventually reach zero temperature?

Suppose I have some amount of gas inside an isolated box.As the gas molecules continue colliding with box wall and each other, there will be a loss of energy due to these collisions.So, will over ...

An_Elephant

393

askedSep 15 at 11:41

Question 3

4votes

1answer

150views

Is it possible to use a warm (~150K) cryopump to achieve high vacuum ($10^{-7}$ Torr) if the chamber is roughed and flushed with water vapor?

I understand that water in vacuum chambers presents a challenge because it adsorbs to the surfaces and takes much longer to pump out than other gasses. But if one doesn't care about how long it will ...

Cassandra Parmentier

43

askedSep 1 at 20:13

Question 4

0votes

1answer

141views

Does diffuse matter (gas or dust) near 0K in a vacuum generally absorb high frequency radiation less (than not near 0K)?

I am having a hard time finding clear information on this particular point of data. It would also be helpful to note if near-0K gasses behave differently from non-gasses, additionally.For clarity, &...

hamstar

115

askedJun 1 at 14:49

Question 5

0votes

1answer

118views

Solidification of Oxygen-Nitrogen mixtures

I am trying to understand the phase diagram published in by C.S. Barrett et al. in the Journal of Chemical Physics published in 1967. Figure 1 shows the phase diagram. What happens to the oxygen in ...

Nikolai

9

askedJan 31 at 13:32

Question 6

0votes

1answer

121views

Why Gifford-Mcmahon cycle's Refrigeration Effect is $Q=V(P_1-P_2)$?

This extract is from Advances in Cryogenic Engineering (Vol 11). They do give an explanation for my question in Volume 6, but I am struggling to understand that

Chaser

29

askedSep 25, 2024 at 9:47

Question 7

1vote

1answer

225views

Considerations for phase change through throttle valve

I am looking at characterizing, as well as I can, the exit velocity and density downstream of an isenthalpic throttle valve as a function of the downstream pressure. What is throwing me off is the ...

Sterling Butters

154

askedSep 23, 2024 at 19:27

Question 8

2votes

3answers

278views

Is absolute zero an arbitrary number or would an alien civilization agree it is -273.1° C? [closed]

Can absolute zero be calculated from pure mathematics or does it depend on definitions (such as the boiling point of water and freezing point) and experimentally derived values?

user429115

askedSep 20, 2024 at 21:26

Question 9

2votes

0answers

77views

Near optimally doped superconductors' Ba isotope effect data precision

Is there any freely available transition temperature data for p-type cuprate superconductor samples around optimal oxygen content as a function of average barium isotope mass in a sample and oxygen ...

Paul Kolk

148

askedAug 2, 2024 at 15:35

Question 10

0votes

1answer

126views

Work done by gas and it's limits

So I have read about how when pressurised gas does work, it decreases in temperature (turbo expanders, Claude liquefaction etc.). How exactly does that work? The more work a gas does, the more it ...

Aaa

37

askedMay 26, 2024 at 21:39

Question 11

2votes

2answers

459views

Behavior of quantum gases at low temperature

I am taking an introductory stastistical mechanics course, and one question that was posed during lectures, was to graph the behavior of the average energy per particle ($\overline{E}/N)$, of a Bose-...

Jack

1,267

askedApr 24, 2024 at 8:26

Question 12

0votes

2answers

556views

What happens to Capacitors at extreme temperatures and pressures?

In my University physics class [first year engineering student] I learned that"for a capacitor in a vacuum, capacitance $C$ depends only on the shapes, dimensions, and separations of the ...

William Banquier

25

askedFeb 21, 2024 at 3:52

Question 13

1vote

0answers

57views

How can you rapidly warm a large body uniformly? [closed]

Given a very non-homogenous large object (mainly water) that's vitrified (cooled down without ice formation) and stored in liquid nitrogen, how do you heat it up to room temperature without ice ...

Heye

11

askedJan 25, 2024 at 12:37

Question 14

1vote

0answers

41views

Techniques to measure/picture very low (cryo) temperatures [closed]

I am looking for an experimental technique to measure/create a temperature map of a small object (few mm diameter), like in terms of IR camera.However, all IR-cameras I encountered measured ...

Agnieszka

195

askedJan 24, 2024 at 12:39

Question 15

0votes

0answers

76views

Questions about CCD sensors and low temperatures?

The dynamic range of a CCD sensor increases at low temp, they say. What does this mean, and why does it happen?Near saturation a CCD sensor begins to exhibit non-linear characteristics. Is this in ...

Ludvig Mörtberg

345

askedOct 17, 2023 at 21:17

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Stack Exchange Network

Questions tagged [cryogenics]

Twistorr Agilent 74fs Vent Valve + Controller (not venting fully)

Will gases contained inside a box eventually reach zero temperature?

Is it possible to use a warm (~150K) cryopump to achieve high vacuum ($10^{-7}$ Torr) if the chamber is roughed and flushed with water vapor?

Does diffuse matter (gas or dust) near 0K in a vacuum generally absorb high frequency radiation less (than not near 0K)?

Solidification of Oxygen-Nitrogen mixtures

Why Gifford-Mcmahon cycle's Refrigeration Effect is $Q=V(P_1-P_2)$?

Considerations for phase change through throttle valve

Is absolute zero an arbitrary number or would an alien civilization agree it is -273.1° C? [closed]

Near optimally doped superconductors' Ba isotope effect data precision

Work done by gas and it's limits

Behavior of quantum gases at low temperature

What happens to Capacitors at extreme temperatures and pressures?

How can you rapidly warm a large body uniformly? [closed]

Techniques to measure/picture very low (cryo) temperatures [closed]

Questions about CCD sensors and low temperatures?

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