Helium

Helium is an element added by various mods.

Vanilla
on the Minecraft Wiki

NuclearCraft
Helium is a common product of due to its very high binding energy per nucleon, but is most easily obtained through the running of. It can be used to produce Liquid Helium.

Liquid Helium is created by supercooling Helium in a. It is used to make and is used by  to cool  in a.