| Zugriffsnummer | 26945 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Determination of the Boltzmann constant by dielectric-constant gas thermometry |
| Autor(in); Institution |
Fellmuth, Bernd; 7.4, Temperatur, PTB-Berlin
Fischer, Joachim; 7.4, Temperatur, PTB-Berlin
Gaiser, Christof; 7.4, Temperatur, PTB-Berlin
Jusko, Otto; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Priruenrom, Tasanee; National Institute of Metrology (NIMT), THAILAND
Sabuga, Wladimir; 3.3, Stoffeigenschaften und Druck, PTB-Braunschweig
Zandt, Thorsten; 7.4, Temperatur, PTB-Berlin
|
| Quelle/Jahr | Metrologia: 48 (2011), 5, 382 - 390 |
| ISSN | 0026-1394 (PRINT) ; 1681-7575 (ONLINE) |
| DOI | |
| Verlag | Bristol [u.a.]: IOP |
| Klassifikationscode | PACS: 06.20.Jr ; PACS: 84.32.Tt ; PACS: 06.20.fb ; PACS: 84.70.+p ; PACS: 07.20.Dt |
| Zusammenfassung | Boltzmann constant k has been determined by dielectric-constant gas thermometry at PTB. In the pressure range from about 1MPa to 7MPa, 11 helium isotherms have been measured at the triple point of water (TPW) by applying a new special experimental setup consisting of a large-volume thermostat, a vacuum-isolated measuring system, stainless-steel 10 pF cylindrical capacitors, an autotransformer ratio capacitance bridge, a high-purity gas-handling system including a mass spectrometer, and traceably calibrated special pressure balances with piston–cylinder assemblies having effective areas of 2 cm2. The value of k has been deduced from the linear, ideal-gas term of an appropriate virial expansion fitted to the combined isotherms. A detailed uncertainty budget has been established by performing Monte Carlo simulations. The main uncertainty components result from the measurement of pressure and capacitance as well as the influence of the effective compressibility of the measuring capacitor and impurities contained in the helium gas. The combination of the results obtained at the TPW kTPW = 1.380 654 × 10−23 JK−1, relative standard uncertainty 9.2 parts per million) with data measured earlier at low temperatures (21K to 27K, (kLT = 1.380 657 × 10−23 JK−1, 15.9 parts per million) has yielded a value of k = 1.380 655 × 10−23 JK−1 with uncertainty of 7.9 parts per million. |
