(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: 2026-05-28 00:51:16
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
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