NIST logo

Publication Citation: Noble gas viscosities at 25 degrees C

NIST Authors in Bold

Author(s): Robert F. Berg; William C. Burton;
Title: Noble gas viscosities at 25 degrees C
Published: August 10, 2012
Abstract: Near 25 C, ab initio calculations of the zero-density viscosity of helium gas eta_He have an uncertainty of approximately 0.001 %, which is 1/40th of the uncertainty of the best measurements. The uncertainties of the published calculations for neon [Bich et al. (2008)] and argon [Bich et al. (2007)] are probably much larger. We present new measurements of the viscosities of neon, argon, and krypton obtained at 25 C in a viscometer that was calibrated with helium. The resulting viscosity ratios are eta_Ne/eta_He = 1.59836 +/- 0.00037, eta_Ar/eta_He = 1.13763 +/- 0.00030, and eta_Kr/eta_He = 1.27520 +/- 0.00040. The argon ratio agrees with a recent, unpublished calculation [JB Mehl, private communication (2012)] to within the combined uncertainty (measurement plus calculation) of 0.032 %. The neon ratio is smaller than the calculated value by 0.13 %.
Citation: Molecular Physics
Volume: 111
Pages: pp. 193 - 197
Research Areas: Gas Metrology
DOI: http://dx.doi.org/10.1080/00268976.2012.713132  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (80KB)