Elsevier

Physica

Volume 32, Issue 5, May 1966, Pages 900-912
Physica

The vapour pressure of liquid nitrogen

https://doi.org/10.1016/0031-8914(66)90021-8Get rights and content

Abstract

The vapour pressure-temperature relation of liquid nitrogen has been measured from the boiling point to the triple point. Temperatures have been measured with platinum resistance thermometers. According to our experimental results the boiling point and the triple point temperatures of nitrogen are 77.343°K and 63.141°K on the average reduced scale, the triple point pressure is 93.91 mm Hg, 0°C.

The vapour pressure of liquid nitrogen has been computed also from a thermodynamic vapour pressure-temperature relation for every degree from the triple point to the boiling point.

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  • Low-temperature heat capacity measurements on insulating powders sealed under pressure

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    Citation Excerpt :

    Since the pressure inside the pan was permitted to change during the measurement, the nitrogen is expected to exist in an equilibrium mixture of phases near each transition; thus, the shift between phases would be more gradual than in a constant pressure system. Furthermore, the system is expected to pass through the triple point of nitrogen near 63 K and 12.5 kPa [81–83]. As a further check on the accuracy of the benzoic-acid-plus-nitrogen measurement, we calculated the enthalpy of the broad transition from 54 to 93 K. To do this, we fit the data to a smoothed least-squares cubic spline and subtracted the lattice contributions.

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