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Updated: May 12, 2025
"If," he said pontifically, "they are oriented in the same direction, we refer to the substance as orthohydrogen. If they are oriented in opposite directions, it is parahydrogen. The ortho molecules rotate with odd rotational quantum numbers, while the para molecules rotate with even quantum numbers.
"Indeed," he rambled on, "Treadmore babbled for Heaven knows how long on the relative occurrence of parahydrogen and orthohydrogen on Eisberg." He took his eyes from the glass and looked down at the girl who was seated demurely on the edge of his bunk. Her smile was encouraging.
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