Quote Originally Posted by s7e9h3n

Orignially this unit was build for some kind of nuclear lab work. It was designed to remove 10W of heat @ -185C Chilly tells me that one of the six stages actually used methane - which, afaik, is the lowest boiling refrigerant behind only air and helium.......
with methane you can't get -185*C, the methane probably condenses something like argon or something like that. their are a lot of gasses with lower boiling point then methane.

@Ratax, you seperate the gasses by using the fact that one gas condenses at an other point then the other. gravity seperates the liquid refrigerant from the gaseous refrigerant. to seperate 2 gasses from each other is much harder, you'll need some very advanced equipment for that