The 1962 He3 scale of temperatures. III. Evaluation and status

TLDR

The paper evaluates the 1962 He³ temperature scale for its precision and its deviations from the thermodynamic Kelvin scale. The authors employ a multiple‑variable least‑squares analysis to derive the final scale equation and re‑analyse isotherm data. They present He³ thermodynamic quantities consistent with the 1962 scale, tabulate corrections for small amounts of He⁴ in vapor‑pressure measurements, and discuss the scale’s current status and future prospects.

Abstract

In this third paper the 1962 He3 Scale of Temperatures is evaluated both as to its precision and its deviations from the thermodynamic Kelvin Scale. Various thermodynamic quantities of He3 consistent with the 1962 He3 Scale are derived and listed. The correction to an observed vapor pressure for small amounts of He4 is discussed and tabulated. A description is given of the method of multiple variable least squares analysis used for deriving the final scale equation and for re-analysis of isotherm data. Finally the present status of the 1962 He3 Scale is discussed along with some considerations for the future.