Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics The form of the hydrogen molecule in which the two nuclei have antiparallel spin; about 25% of hydrogen at room temperature.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

para- +‎ hydrogen

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Examples

  • The melting and boiling points of parahydrogen are about 0. 1°C lower than those of normal hydrogen.

    Hydrogen 2008

  • If they are oriented in opposite directions, it is _parahydrogen_.

    Unwise Child Randall Garrett 1957

  • Hyperpolarisation involves transferring the magnetism of parahydrogen to molecules, making them more visible to nuclear magnetic resonance, an important research tool in chemistry, and

    The Engineer - News 2010

  • Hyperpolarisation with parahydrogen is a technique developed at York University that can, it is claimed, dramatically increase the sensitivity of MRI, the scanning technology widely used in hospitals.

    The Engineer - News 2010

  • The melting and boiling points of parahydrogen are about 0. 1°C lower than those of normal hydrogen. isotope of hydrogen, H, is known as Protium, the other two isotopes are Deuterium (a proton and a neutron) and Tritium (a protron and two neutrons).

    Featured Articles - Encyclopedia of Earth 2010

  • The melting and boiling points of parahydrogen are about 0. 1°C lower than those of normal hydrogen. isotope of hydrogen, H, is known as Protium, the other two isotopes are Deuterium (a proton and a neutron) and Tritium (a protron and two neutrons).

    Featured Articles - Encyclopedia of Earth 2009

  • "Indeed," he rambled on, "Treadmore babbled for Heaven knows how long on the relative occurrence of parahydrogen and orthohydrogen on

    Unwise Child Randall Garrett 1957

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