Helium
Гелий · 헬륨 · Гелий · Hélio · Heliu · Хелијум · Гелий · Elio · هلیوم · Helio · Hel · 氦
| CAS | 7440-59-7 |
|---|---|
| EC | 231-168-5 |
| UN | 1963 |
| Formula | He |
| Molar mass | 4.0026 g/mol |
| Relative density of the gas or vapour (air = 1) | 0.138 |
| GHS | Warning · H280, H281 |
Helium(0) is a monoatomic helium. It has a role as a NMR chemical shift reference compound and a member of food packaging gas. Helium appears as a colorless, odorless, noncombustible gas. Can asphyxiate. Inhalation causes the voice to become squeaky (Mickey Mouse voice).