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Word: orthohydrogen (lookup in dictionary) (lookup stats)
Dates: during 1929-1929
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Usage:

...struck the glowing wire it interfered with the light and caused the mirror beam to move in one direction. That done, Dr. Bonhoeffer passed untreated hydrogen over the same wire. The mirror beam moved differently. That was proof that he had two different kinds of hydrogen, which he called orthohydrogen and parahydrogen...

Author: /time Magazine | Title: Science: Chemical Meeting | 9/23/1929 | See Source »

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