Hydrogen
Apart from its use as a reactant, H2 has wide applications in physics and engineering. It is used as a shielding gas in welding methods such as atomic hydrogen welding. H2 is used as the rotor coolant in electrical generators at power stations, because it has the highest thermal conductivity of any gas. Liquid H2 is used in cryogenic research, including superconductivity studies. Because H2 is lighter than air, having a little more than 1/14 of the density of air, it was once widely used as a lifting gas in balloons and airships.
What research uses liquid H2?
cryogenic
Liquid H2 is used in cryogenic research, including superconductivity studies.
liquid H2