The bloke at the Youtube channel Veritasium has a good video [0] where he makes LN2 using a Helium stirling engine chiller [1]. [0] - https://www.youtube.com/w

The bloke at the Youtube channel Veritasium has a good video [0] where he makes LN2 using a Helium stirling engine chiller [1]. [0] - https://www.youtube.com/watch?v=dCXkaQa53QQ https://www.youtube.com/watch?v=dCXkaQa53QQ [1] - https://en.wikipedia.org/wiki/Cryocooler#Stirling_refrigerators https://en.wikipedia.org/wiki/Cryocooler#Stirling_refrigerat...