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Liquid hydrogen

Names IUPAC nameHydrogenSystematic IUPAC nameLiquid hydrogenOther names Hydrogen (cryogenic liquid), Refrigerated hydrogen; LH2, para-hydrogenIdentifiers CAS Number1333-74-03D model (JSmol)Interactive imageChEBICHEBI:33251ChemSpider762KEGGC00282PubChemCID783RTECS numberMW8900000UNII7YNJ3PO35ZUN number1966InChIInChI=1S/H2/h1HKey: UFHFLCQGNIYNRP-UHFFFAOYSA-NInChI=1/H2/h1HSMILES[H][H]Properties Chemical formulaH2(l)Molar mass2.016 g·mol Appearance Colorless liquid Density0.07085 g/cm (4.423 lb/cu ft) Melting point−259.14 °C (−434.45 °F; 14.01 K) Boiling point−252.87 °C (−423.17 °F; 20.28 K) Hazards GHS labelling: PictogramsSignal wordDangerHazard statementsH220, H280Precautionary statementsP210, P377, P381, P403NFPA 704 (fire diamond) 340CRYOAutoignitiontemperature571 °C (1,060 °F; 844 K) Explosive limitsLEL 4.0%; UEL 74.2% (in air) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Yverify ( ?)

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