Vapor Pressures of Natural Neon and of the Isotopes²⁰Ne and²²Ne from the Triple Point to the Normal Boiling Point

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: