Assertion: hydrogen's energy | /r/HasProperty | retained in the liquid state.[citation
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text: Notably, the boiling points of parahydrogen and normal (3:1) hydrogen are nearly equal; for parahydrogen ∆H vap = 898 J/mol at T b = 20.277 K, and it follows that nearly all the residual rotational energy of orthohydrogen is retained in the liquid state.[citation needed]