Vapor Pressures of Natural Neon and of the Isotopes20Ne and22Ne from the Triple Point to the Normal Boiling Point
- 1 January 1972
- journal article
- Published by IOP Publishing in Metrologia
- Vol. 8 (1) , 11-27
- https://doi.org/10.1088/0026-1394/8/1/004
Abstract
Apparatus design and procedures are described for the determination of the vapor pressures of naturally occurring neon (natNe) and the pure isotopes 20Ne and 22Ne from their triple points (TP) to their normal boiling points (NBP). The data have been fitted to vapor-pressure equations with root-mean-square deviations of ± 2.5 to ± 4.7 N/m2 (± 0.019 to ± 0.035 mmHg). The TP pressures (P) and the TP and NBP temperatures (T) were found to be: TP NBP P T, K T, K natNe 43332 ± 13 N/m2 (325.02 ± 0.10 mmHg) 24.553 ± 0.001 27.096 ±0.001 20Ne 43326 ± 13 N/m2 (324.97 ± 0.10 mmHg) 24.540 ± 0.001 27.084 ± 0.001 22Ne 43654 ± 13 N/m2 (327.43 ± 0.10 mmHg 24.687 ± 0.001 27.211 ± 0.001 (The temperatures are in terms of the NBS-1955 provisional temperature scale. The figures after the ± symbol indicate estimated uncertainties). The calculated vapor pressures of the isotopic natNe, based on Raoult's law of solution and the observed vapor pressures of the pure isotopes, are in agreement within the combined precision of the measurements with the observed values of natNe.Keywords
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