Liquid hydrogen
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Liquid hydrogen is the liquid state of the element hydrogen. Hydrogen is found naturally in the molecular H₂ form.
To exist as a liquid, H₂ must be cooled below its critical point of 33 K. Wikipedia
Density: 0.07085 g/cm3 (4.423 lb/cu ft)
Boiling point: -423°F (-252.8°C)
Chemical formula: H2(l)
Melting point: -434.5°F (-259.2°C)
Colors: Colorless
3D model (JSmol): Interactive image
Explosive limits: LEL 4.0%; UEL 74.2% (in air)