parahydrogen
English
Etymology
para-
+
hydrogen
Noun
parahydrogen
(
countable and uncountable
,
plural
parahydrogens
)
(
physics
)
The form of the
hydrogen
molecule
(H
2
) in which the two
nuclei
have
antiparallel
spin
; about 25% of hydrogen at room temperature.
Antonyms
orthohydrogen
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