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 Originally Posted by OngBonga
I can't remember what liquid they used, but they would put tubes upright into the ground with a liquid trapped inside. It would settle in the bottom, and evaporate, rising to the top as a vapour, where it would condese, and settle at the bottom as a liquid. Ths cycle would transfer heat from the ground to the atmopshere, reducing the local ground temperature just enough to keep it frozen all year round.
The liquid is ammonia.
Yes, this is an interesting bit of engineering. They have oxygen producing factories along the route, since it is so far above sea level.
Fascinating!
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I just want to be clear that I absolutely concur with you that condensation deposits temperature.
I'm merely skeptical about the extent of the effect in the particular question that Renton posed.
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