ortho-hydrogen

noun \ ¦ȯ(r)thə+ \

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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