I would like to know about the reason for why Helium do not have triple point?

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Yadollah Tavan

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

Jack Denur

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.