A Novel Principle for the Measurement of Low Temperature
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.
KeywordsMolecular Hydrogen Equilibrium Composition Hydrogen Flow Rate Rotational Quantum Number Normal Boiling Point
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