SINCE 1828
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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