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Highly-accurate density-virial-coefficient values for helium, neon, and argon at 0.01 ○C determined by dielectric-constant gas thermometry
- Source :
- The Journal of Chemical Physics. 150:134303
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- The dielectric-constant gas thermometer of Physikalisch-Technische Bundesanstalt (PTB) developed for measuring the Boltzmann constant with a relative uncertainty of 1.9 parts per million was used for determining the virial coefficients of the three noble gases, helium, neon, and argon, at the triple point of water (0.01 ○C). For this purpose, isotherms were measured up to a maximum pressure of 7 MPa. The evaluation of the highly accurate data by fitting is required to derive an extended working equation for the dependence of the gas pressure on the dielectric constant. The following values have been obtained for the second B and third C virial coefficients, with the standard uncertainties given in parentheses as a multiple of the last digit, considering literature data for the dielectric virial coefficients: helium: BDCGTHe0.01 ○C=11.925715 cm3/mol, CDCGTHe0.01 ○C=113.4958 cm6/mol2; neon: BDCGTNe0.01 ○C=10.994528 cm3/mol, CDCGTNe0.01 ○C=215.815 cm6/mol2; argon: BDCGTAr0.01 ○C=−21.233144 cm3/mol, CDCGTAr0.01 ○C=1143.339 cm6/mol2. These values are compared with the results of the latest ab initio calculations of the second and third virial coefficients.
- Subjects :
- Argon
Materials science
010304 chemical physics
Gas thermometer
Triple point
General Physics and Astronomy
chemistry.chemical_element
Thermodynamics
Dielectric
010402 general chemistry
01 natural sciences
0104 chemical sciences
Neon
symbols.namesake
chemistry
Virial coefficient
0103 physical sciences
Boltzmann constant
symbols
Physical and Theoretical Chemistry
Helium
Subjects
Details
- ISSN :
- 10897690 and 00219606
- Volume :
- 150
- Database :
- OpenAIRE
- Journal :
- The Journal of Chemical Physics
- Accession number :
- edsair.doi...........f78889263223a5788b85bbbfc63cbf1b