Helium ∙ hélium ∙ elio ∙ helio
group ‘n+n’ / noble gases and (rather) noble metals: R, RO4
- melting point: -272.2°C @ 26 atmos.
- boiling point: -268.934°C
- density: 0.17 g/l
I can imagine that in 50 years time our children will be saying ‘I can’t believe they used such a precious material to fill balloons’. — P. Wothers
Die moderne Magnetrenonanz-Tomographie (MRT) wäre ohne flüssiges Helium als ‘Kältequelle’ für die supraleitende Magnetspule unmöglich. — carbagas
The mass ratio of helium to hydrogen nuclei [in primary cosmic rays], 28%, is similar to the primordial elemental abundance ratio of these elements, 24%. — wikipedia