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Definition of ortho-hydrogen
: molecular hydrogen in which the two hydrogen nuclei are spinning in the same direction
ordinary hydrogen gas comprises an equilibrium mixture of three parts of ortho-hydrogen (with parallel nuclear spin) to one part of para-hydrogen (with antiparallel nuclear spin)— Otto Reinmuth
— compare para-hydrogen
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“Ortho-hydrogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ortho-hydrogen. Accessed 10 May. 2021.
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