Re:Trans-Planetary Subway Systems (1978)
by qayxc on Sunday April 11, 2021 @02:50PM
(#26772499)
> It was an air bearing in a reduced (but still fairly high) pressure tube.
You are a funny guy :) According to the source [0], the pressure was intended to be 100 Pa ("about 1/6 the pressure of the atmosphere of Mars").
Technically speaking, this is a fairly good medium vacuum [1].
The term "vacuum" itself refers to "a space from which most of the air or gas has been removed" [2], so you don't have to go into the intergalactic void to achieve it. I think ~99.9% qualifies as "most" :D
Re:Trans-Planetary Subway Systems (1978)
by aidenn0 on Sunday April 11, 2021 @03:22PM
(#26772726)
Thanks for the correction. I misremembered it as 1/6 the pressure of Earth's atmosphere which is obviously wrong. Yes 100Pa qualifies as "evacuated" by most reasonable definitions.
You are a funny guy :) According to the source [0], the pressure was intended to be 100 Pa ("about 1/6 the pressure of the atmosphere of Mars").
Technically speaking, this is a fairly good medium vacuum [1].
The term "vacuum" itself refers to "a space from which most of the air or gas has been removed" [2], so you don't have to go into the intergalactic void to achieve it. I think ~99.9% qualifies as "most" :D
[0] https://www.tesla.com/sites/default/files/blog_images/hyperl... pg. 12
[1] https://en.wikipedia.org/wiki/Vacuum
[2] https://dictionary.cambridge.org/dictionary/english/vacuum