| Автор | D Gugan |
| Автор | G W Michel |
| Дата выпуска | 1980-10-01 |
| dc.description | A new method of high-precision isotherm thermometry has been developed in which the density of helium gas is determined from dielectric constant measurements using the virial expansion of the Clausius-Mossotti equation. The technique is shown to be accurate at the level of similar 0.3 mK for the range 4.2-27.1 K, with potential for both increased accuracy and increased range. The results confirm that the gas thermometer scale NPL-75 is internally consistent to better than 1 mK, and that Berry's recent values for the second virial coefficient of helium are correct at the level similar ± 0.05 cm<sup>3</sup> mol<sup>-1</sup>. The results also give a value for the third virial coefficient, C(T) = (5420 ± 225)/T cm<sup>6</sup> mol<sup>-2</sup>, and a value of 517.257 ± 0.025 × 10<sup>-3</sup> cm<sup>3</sup> mol<sup>-1</sup> for the polarizability of <sup>4</sup>He. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Dielectric Constant Gas Thermometry from 4.2 to 27.1 K |
| Тип | paper |
| DOI | 10.1088/0026-1394/16/4/002 |
| Electronic ISSN | 1681-7575 |
| Print ISSN | 0026-1394 |
| Журнал | Metrologia |
| Том | 16 |
| Первая страница | 149 |
| Последняя страница | 167 |
| Аффилиация | D Gugan; H H Wills Physics Laboratory, Bristol, UK |
| Аффилиация | G W Michel; H H Wills Physics Laboratory, Bristol, UK |
| Выпуск | 4 |
