We are able to get liquid nitrogen from our local state college. We have small Dewar flasks just the size to fit a test tube. We hang a test tube from the ceiling on a string. Hang the tube from the ceiling. London dispersion forces.
Paramagnetism depends on a substance having unpaired electrons.
For most of first-year chemistry, this model is adequate and very useful. Oxygen is an oxidizer. The liquid nitrogen and liquid oxygen are also very cold so they should not be touched. I just pour it on the floor.