Helium
CAS 7440-59-7He4.0026 g/mol
Helium(0) is a monoatomic helium. It has a role as a NMR chemical shift reference compound and a member of food packaging gas.
IUPAC: helium
PubChem
Physical & Chemical Properties
| Melting Point | -272.2 |
| Boiling Point | -269 |
| Density | 1.64 g/L |
| Solubility | 1.5mg/L |
| Appearance | Helium appears as a colorless, odorless, noncombustible gas. Can asphyxiate. Inhalation causes the voice to become squeaky (Mickey Mouse voice). Exposure of the container to prolonged heat or fire can cause it to rupture violently and rocket. If liquefied, contact of the very cold liquid with water causes violent boiling. Pressures may build to dangerous levels if the liquid contacts water in a closed container. Used in arc welding, to trace leaks in refrigeration and other closed systems and as a lifting gas for lighter-than-air aircraft. |
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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