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A comment on Hyperloop: Pipes of Fancy. Parent comment

Re:Hyperloop: Pipes of Fancy by chrisco255 on Wednesday August 12, 2020 @10:27PM (#24139368)
Hyperloop is not a full vacuum, only partial vacuum if I'm not mistaken. I don't know what kind of difference that would make on pressure but I assume that means that the tubes are not air tight and actually breathe.
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Re:Hyperloop: Pipes of Fancy by ClumsyPilot on Wednesday August 12, 2020 @10:52PM (#24139505)
Hyper-loop requires 99.99% of the air to be removed from the tube, so it is complete vacuum from the lethality / safety and structure / pressure perspective.

I am not sure what do you mean by 'ubes are not air tight and actually breathe', but they definitely are not air permeable.

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