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parahydrogen

[ par-uh-hahy-druh-juhn ]

noun

, Physics, Chemistry.
  1. the form of molecular hydrogen in which the nuclei of the two hydrogen atoms contained in the molecule have spins in opposite directions.


parahydrogen

/ ˌpærəˈhaɪdrədʒən /

noun

  1. chem 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 Compare orthohydrogen
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of parahydrogen1

First recorded in 1925–30; para- 1 + hydrogen
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Example Sentences

If they are oriented in opposite directions, it is parahydrogen.

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