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Author: Robert Berg

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1. Recommended viscosities of 11 dilute gases at 25¿°C
Published: 12/13/2012
Authors: Robert F Berg, Michael R Moldover
Abstract: Commercially manufactured meters that measure the flow of a process gas are often calibrated with a known flow of a surrogate gas. This requires an accurate model of the flow meter and accurate values of the relevant thermophysical properties for bo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911784

2. Recommended vapor pressure and thermophysical data for ferrocene
Published: 8/14/2012
Authors: Michal Fulem, Kvetoslav Ruzicka, Marisa A.A. Rocha, Luis M.N.B.F. Santos, Robert F Berg
Abstract: Recommended vapor pressure data for ferrocene (CAS Registry Number: 102-54-5) in the temperature range from 242 to 447 K were developed by the simultaneous correlation of critically assessed vapor pressures, heat capacities of the crystalline phase a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911175

3. Noble gas viscosities at 25 degrees C
Published: 8/10/2012
Authors: Robert F Berg, William Cody Burton
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 [ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911234

4. Calibration of Laminar Flow Meters for Process Gases
Published: 6/1/2012
Authors: John D Wright, Thiago Cobu, Robert F Berg, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) with five gases (N2, Ar, He, CO2, and SF6) over a 10:1 flow range using NIST‰s primary flow standards as re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908560

5. Thermoelectric temperature control device for vapor pressure measurements
Published: 8/31/2011
Author: Robert F Berg
Abstract: The static method of measuring equilibrium vapor pressure requires locating the sample at the coldest part of the apparatus to avoid errors due to evaporation and recondensation elsewhere. This paper describes a device that can hold the sample 1 K ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908721

6. Accurate Measurements of Process Gas Flow with Laminar Flow Meters
Published: 10/15/2010
Authors: Thiago Cobu, Robert F Berg, John D Wright, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST‰s primary flow standards and a physical model. Without addi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906313

7. Shear Thinning Near the Critical Point of Xenon
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830987

8. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Published: 8/1/2007
Authors: E May, Robert F Berg, Michael R Moldover
Abstract: We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830996

9. Transport Properties of Argon at Zero Density From Viscosity-Ratio Measurements
Published: 4/1/2006
Authors: E May, Michael R Moldover, Robert F Berg, John J. Hurly
Abstract: We determined the zero-density viscosity and thermal conductivity of argon with an uncertainty of only 0.039 % in the temperature range 200 K to 400 K. Our results will improve: (1) the argon-argon interatomic potential, (2) calculated boundary-laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830959

10. Erratum: Simple Flow Meter and Viscometer for Gases With 0.04 % Uncertainty [Metrologia 42, 11-23 (2005)]
Published: 2/1/2006
Author: Robert F Berg
Abstract: This is an erratum.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830958



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