What Are the Best Dimensions and Materials for High Vacuum Transparent Tubes?

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Discussion Overview

The discussion revolves around the optimal dimensions and materials for constructing high vacuum transparent tubes, specifically focusing on a proposed diameter of 30 cm and a length of 1-1.5 m, with a target vacuum level of 0.2-2 Pa.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the feasibility of specifying a theoretical limit for the dimensions of a transparent tube, suggesting that thicker glass could be used as the size increases.
  • Another participant asks about the necessary thickness of the glass to withstand the vacuum pressure, indicating uncertainty about material properties.
  • There is a suggestion to consider using a parabolic function in the design, although the context of this suggestion is unclear.
  • Some participants express frustration with the lack of constructive dialogue and emphasize the importance of understanding the underlying reasons for the original question.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the optimal dimensions or materials for the transparent tube, and multiple competing views regarding the nature of the inquiry and the responses to it remain evident.

Contextual Notes

There is a lack of clarity regarding the assumptions behind the proposed dimensions and the specific requirements for material strength under vacuum conditions. The discussion does not resolve these uncertainties.

Kamil19991
Hello
For the purpose of the experiment, I wonder what the maximum dimensions can have a transparent tube, I thought over a diameter of 30cm and a length of 1-1,5m and from what material should such a pipe be made. I would like to get a high vacuum (about 0,2-2Pa)
 
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Kamil19991 said:
Hello
For the purpose of the experiment, I wonder what the maximum dimensions can have a transparent tube, I thought over a diameter of 30cm and a length of 1-1,5m and from what material should such a pipe be made. I would like to get a high vacuum (about 0,2-2Pa)
I don't see how you can specify a theoretical limit since you could just make thicker and thicker glass tubes as the size goes up. What's your point in asking?
 
phinds said:
I don't see how you can specify a theoretical limit since you could just make thicker and thicker glass tubes as the size goes up. What's your point in asking?
So what thickness should the glass have in such a size to withstand?
 
Kamil19991 said:
So what thickness should the glass have in such a size to withstand?
I have no idea. I ask AGAIN ... What's your point in asking?
 
phinds said:
I have no idea. I ask AGAIN ... What's your point in asking?

Not very constructive advice methinks. How about you take a timeout.

OP have you tried using a parabolic function?
 
Kamil19991 said:
So what thickness should the glass have in such a size to withstand?
How long is a string?
 
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Kuzon said:
Not very constructive advice methinks.

Trying to find out why someone is asking a question can in fact be the most constructive approach, in my experience. Often the questioner doesn't have a well-formed question, and so attempting to answer it is not very constructive.
 
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