Helium (He) is a lightweight, inert noble gas that exists as a liquid or solid only under extreme cryogenic conditions; in practical engineering contexts, it is most often encountered as a pressurized gas. The material is valued in aerospace, medical imaging, and cryogenic cooling applications for its exceptional thermal conductivity, inertness, and low density, making it irreplaceable in superconducting magnet systems, deep-sea diving gas mixtures, and precision leak detection where alternative gases would introduce contamination or safety risks.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K) | 840.0 | MPa | — | ||
Poisson's Ratio(ν) | 0.2900 | - | — | ||
Shear Modulus(G) | 450.0 | MPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 382 | kg/m³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 17.73 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | -484.8 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | 0.000 | eV/atom | — |