WHILE owing to helium's absence of chemical affinities it might at first sight be imagined that its separation from a mixture of other gases could best be carried out by effecting chemical changes in the latter, in only a very few cases is this a practical procedure. Indeed, at the present time all helium, which is being recovered from natural gas, is obtained by physical means.
Teed, M.P.L. (1930), "A Review of the Helium Question: A Comprehensive Survey of its Properties, Sources of Supply and Possibilities for Use in Airships", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 10, pp. 265-266. https://doi.org/10.1108/eb029328
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