Industrial gas: helium
Linde Gas

Linde operates one of the world's largest helium plants in Otis, Kansas and several other facilities around the world including Algeria, Quatar and Australia.

Our network of more than 50 helium transfill facilities, located in all major helium markets around the Globe, provides the most reliable distribution network in the industry.

Important physical data:
* Symbol for helim: HE
* Atomic number 2
* Molar Mass 4.0026 g/mol
* Boiling point (at 1.013 bar) 4.22 K (-268.93)
* Density at boiing point - liquid 125 kg/m3
* Density at boiling point - vapour 17kg/m3
* Density (1 bar, 15 oC) 0.167 kg/m3
* Heat of vapourization
* Thermal conductivity (1bar, 15 oC) 0.1482 W/m*K
* Relative density with respect to air (1bar, 15 oC) 0.138
* Critical temperatures 5.21 K (-267.94)
* Critical pressure 2.29 bar
* Critical density 69.7 kg/m3
* Ionization energy 24.587 eV
* Stable isotopes He-4 99 .999862%
* Stable isotopes He-3 0.000138%