(3He)helium
- CAS NO.：14762-55-1
- Empirical Formula: He
- Molecular Weight: 2.993602
- MDL number: MFCD00083847
- EINECS: 238-822-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 13:16:50
What is (3He)helium ?
Chemical properties
Helium-3,3He, has been known as a stable isotope since the middle-1930s and it was suspected that its properties were markedly different from the common isotope, helium-4.
History
The development of nuclear fusion devices in the 1950s yielded workable quantities of pure helium-3 as a decay product from the large tritium inventory implicit in maintaining an arsenal of fusion weapons.
Definition
ChEBI: The stable isotope of helium with relative atomic mass 3.016029. The least abundant (0.000137 atom percent) isotope of naturally occurring helium.
Properties of (3He)helium
| Melting point: | -272.14°C |
| Boiling point: | -269.97°C (estimate) |
| Density | 0.041 g/cm3 |
| form | gas |
| EPA Substance Registry System | Helium, isotope of mass 3 (14762-55-1) |
Safety information for (3He)helium
| Signal word | Warning |
| Pictogram(s) |
 Gas Cylinder Compressed Gases GHS04 |
| GHS Hazard Statements |
H280:Gases under pressure |
| Precautionary Statement Codes |
P410+P403:Protect from sunlight. Store in a well-ventilated place. |
Computed Descriptors for (3He)helium
New Products
3-AMINO-3-(2-FLUORO-PHENYL)-PROPIONIC ACID Pentadecanoic acid Hendecanoic acid 2-AMINO-3-METHYLQUINOLINE HYDROCHLORIDE 3-Hydroxypropionitrile DL-3-Amino-3-(2-methoxyphenyl)propionic acid 5-Bromo-2-Fluoropyridine 2,3-Diamino-5-Chloropyridine 2-Amino-3-Hydroxypyridine 2,6-Diamino Pyridine 4-Amino-2-Chloropyridine 2-Hydroxy-4-Picoline 4-(4-(Dimethylamino)-1-(4-fluorophenyl)-1-hydroxybutyl)-3-(hydroxymethyl)benzonitrile 4-Bromo-3-(ethoxymethyl)benzoic acid 2,4-Dichloro-5-methoxyaniline 4,6-Dichloro-2-(propylthio)pyrimidin-5-amine N2-Isobutyryl-2'-O-methylguanosine 2-chloro-5-methylpyridin-4-amine 4-Bromobenzaldehyde 2-Chloro-6-nitro benzothiazole 2-Amino-4-phenyl-thiazole 4-Chloro-2-methyl quinoline 2-(Chloromethyl) quinazolin-4(3H)-one 5-Phenyl-[1,3,4]-thiadiazol-2-amineRelated products of tetrahydrofuran
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