A Novel Principle for the Measurement of Low Temperature

  • A. H. Singleton
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 10)


The temperature region between the boiling point of neon and the triple point of nitrogen is notable for its lack of a convenient primary standard for the calibration of secondary temperature-measuring instruments. Such a standard has now been recognized and developed by utilizing the known equilibrium composition-temperature relationship for para-ortho mixtures of molecular hydrogen. A stream of molecular hydrogen is equilibrated with a catalyst in thermal equilibrium with the environment whose temperature is to be measured. Subsequent analysis of the equilibrated stream allows the evaluation of the temperature through the known equilibrium composition-temperature relationship.


Molecular Hydrogen Equilibrium Composition Hydrogen Flow Rate Rotational Quantum Number Normal Boiling Point 


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Copyright information

© Plenum Press, New York 1965

Authors and Affiliations

  • A. H. Singleton
    • 1
  1. 1.Air Products and Chemicals, Inc.AllentownUSA

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