|
|
|
Substance Name: Helium [USP]
RN: 7440-59-7
UNII: 206GF3GB41
InChIKey: SWQJXJOGLNCZEY-UHFFFAOYSA-N
Note
- A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics.
Molecular Formula
- He
Molecular Weight
- 4.0026
- All
- Classifications
- Links to Resources
- Names & Synonyms
- Registry Numbers
- Structure Descriptors
- Physical Properties
Classification Codes
Classification Code
- Gases, Diluent for
Superlist Classification Code
- Simple Asphyxiant
* denotes mobile formatted website
Links to Resources
NLM Resources (File Locators)
Regulatory Agencies (Superlist Locators)
Other Resources (Internet Locators)
Search for this InChIKey on the Web
Names and Synonyms
Name of Substance
- Helium
- Helium [USP]
MeSH Heading
- Helium
Synonyms
- Atomic helium
- EINECS 231-168-5
- Helium
- Helium-4
- HSDB 553
- o-Helium
- p-Helium
- UNII-206GF3GB41
Systematic Name
- Helium
Superlist Names
- Helium
- Helium, compressed
- Helium, compressed [UN1046] [Nonflammable gas]
- Helium, refrigerated liquid (cryogenic liquid)
- Helium, refrigerated liquid (cryogenic liquid) [UN1963] [Nonflammable gas]
- UN1046
- UN1963
Registry Numbers
CAS Registry Number
- 7440-59-7
FDA UNII
- 206GF3GB41
Other Registry Numbers
- 1312815-28-3
- 494798-31-1
System Generated Number
- 0007440597
Structure Descriptors
InChI
InChI=1S/HeInChIKey
SWQJXJOGLNCZEY-UHFFFAOYSA-NSmiles
[He]Physical Properties
| Physical Property | Value | Units | Temp (deg C) | Source |
|---|---|---|---|---|
| Melting Point | -2.68E+02 | deg C | EXP | |
| Boiling Point | -2.69E+02 | deg C | EXP | |
| log P (octanol-water) | 0.28 | (none) | EXP | |
| Water Solubility | 2.5 | mg/L | 21 | EXP |
| Atmospheric OH Rate Constant | 0.0 | cm3/molecule-sec | 25 | EST |
Physical property data is provided to ChemIDplus by SRC, Inc.