parahydrogen

[par-uh-hahy-druh-juhn]

par·a·hy·dro·gen

[par-uh-hahy-druh-juhn]
noun Physics, Chemistry.
the form of molecular hydrogen in which the nuclei of the two hydrogen atoms contained in the molecule have spins in opposite directions.
Compare orthohydrogen.


Origin:
1925–30; para-1 + hydrogen
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Parahydrogen is always a great word to know.
So is radiant energy. Does it mean:
energy transmitted in wave motion, especially electromagnetic wave motion
the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation
Collins
World English Dictionary
parahydrogen (ˌpærəˈhaɪdrədʒən)
 
n
chem Compare orthohydrogen the form of molecular hydrogen (constituting about 25 per cent of the total at normal temperatures) in which the nuclei of the two atoms in each molecule spin in opposite directions

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