This seems to be a fluid added by Extra Bees.
It can be stored in a variety of containers, including buckets, wax capsules, tin cans, and glass bottles.
There is also a gaseous version (not to be confused with the "Gaseous Nitrogen" added by GregTech), which cannot be stored in any containers.
Liquid Nitrogen can be obtained from squeezing Kelvin Drops, which are obtained from running Glacial Combs through a Centrifuge.
Glacial Combs can be obtained from Absolute Bees.
Liquid Nitrogen can be used to acclimate bees (Lower Temperature Tolerance)