Making liquid nitrogen from air

The foreign wikipedia claims that the Linde method uses a pressure of 200bar. I doubt, that your refrigerator compressor can produce that.

 

It's infinitely easier to just buy it from a commerical vendor - it's really cheap. Any DIY attempt would likely also make LOX, which could be very dangerous.

 

what are counter-current coils? what would they do?

i know that compressing a gas will cause it to liquefy, depending on temperature, but i don't know how electrical/magnetic fields come into play.

 

he means a countercurrent heat exchanger i.e. you have 2 plug flow reactors one in another, and on the outside one the fluid flows 1 way, the inside one you have the fluid flows another way.