What are the different cases in which a gas may don’t have triple point?
He remains a gas till 4.2 K, so the triple point is defined for its isotopes
please see
http://www.dartmouth.edu/~pchem/75/pdfs/HePhaseDiagrams.pdf
Perhaps at pressures exceeding 25 atmospheres, at which solid helium exists at temperatures very slightly above absolute zero, something closer to a traditional triple point might also exist.
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