Chemistry and Biochemistry Faculty Works

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Browsing Chemistry and Biochemistry Faculty Works by Author "Brooks, James S."

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    The Calculated Properties of Helium II
    (University of Oregon, 1973-12) Brooks, James S.; Donnelly, Russell J.
    There is a continual need for a consistent set of experimental data on helium II. Compilations have been given in the Appendix of Wilks's "The Properties of Liquid and Solid Helium" and Donnelly's "Experimental Superfluidity." Since then, it has become increasingly evident that all quantities must be known as a function of pressure as well as temperature, and an inspection of experimental data shows that there are many gaps in the (T , P)-plane and not a few inconsistencies. We have decided to try to provide an interim solution to this problem by producing empirical formulae which represent the data over the complete range, excluding the transition region near the A-line. The results of these calculations are tabulated in increments of 0.05 Kin temperature from 0.1 K to 2.10 K, and in increments of 2.5 atmospheres from Oto 25 atmospheres. The tables are presented in Part I and are printed on colored sheets to facilitate reference to different properties. The reliability of each table varies, and in some cases the experimental data are inconsistent. Although most tables are believed to agree with experiment to within± 10% below 1.6 K, the discussions of Part II, and where necessary the original data, should be consulted when accuracy is necessary. The authors are acutely aware of the limitations of these tables and would appreciate receiving suggestions to improve them as well as copies of new experimental data as it becomes available. The success of these tables will be measured, in part, by the speed with which they are superseded.