A really good description for how to do it. I've only found one instruction for self-making liquid nitrogen before this site, the one by Ben Krasnow, but that o

A really good description for how to do it. I've only found one instruction for self-making liquid nitrogen before this site, the one by Ben Krasnow, but that one cheats and uses helium cryocooler. I don't really understand why separation of nitrogen from the air is so essential. I'd also like to see a Kapitza liquifier, where in addition to Joule-Thomson effect you use a turbine for cooling and you need less than 8 atm pressure from the compressor, that would be cool :) .