Hydrogen
CAS 1333-74-0H22.016 g/mol
Dihydrogen is an elemental molecule consisting of two hydrogens joined by a single bond. It has a role as an electron donor, an antioxidant, a fuel, a human metabolite and a member of food packaging gas. It is a gas molecular entity, an elemental molecule and an elemental hydrogen.
IUPAC: molecular hydrogen
PubChem
Physical & Chemical Properties
| Melting Point | -434 °F (USCG, 1999) |
| Boiling Point | -423 °F at 760 mmHg (USCG, 1999) |
| Density | 0.071 at -423.4 °F (USCG, 1999) - Less dense than water; will float |
| Solubility | In water, 1.62 mg/L at 21 °C |
| Flash Point | Flammable gas |
| Vapor Pressure | 1.24X10+6 mm Hg at 25 °C |
| Appearance | Hydrogen is a colorless, odorless gas. It is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The vapors are lighter than air. It is flammable over a wide range of vapor/air concentrations. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket. Hydrogen is used to make other chemicals and in oxyhydrogen welding and cutting. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2804
Data: UN Comtrade
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