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Author: Robert Berg

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1. Viscosity-ratio measurements with capillary viscometers
Published: 5/20/2014
Authors: Robert F Berg, Eric F. May, Michael R Moldover
Abstract: Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium resulting from ab initio calculations. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic thermo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914155

2. Hydrogen traps in the outgassing model of a stainless steel vacuum chamber
Published: 3/31/2014
Author: Robert F Berg
Abstract: This article describes a model for hydrogen outgassing into a stainless steel vacuum chamber. It accounts for the geometry of the chamber components, the hydrogen dissolved in those components, and the processes of diffusion, recombination, and trapp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914938

3. Constant pressure primary flow standard for gas flows from 0.01 cm^u3^/min to 100 cm^u3^/min (10^u-8^ mol/s to 10^u-5^ mol/s)
Published: 12/17/2013
Authors: Robert F Berg, Gooding Timothy, Robert Edward Vest
Abstract: We describe a flow meter for gas flows in the range from 0.01 sccm to 100 sccm with a relative standard uncertainty of 0.03 % at 1 sccm. (1 sccm ≈ 1 cm3/min of an ideal gas at 101325 Pa and 0 C ≈ 0.7 mol/s.) The flow meter calibrates a se ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914154

4. Viscosity-ratio measurements with capillary viscometers
Published: 11/27/2013
Authors: Robert F Berg, Eric F. May, Michael R Moldover
Abstract: Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium calculated ab initio. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic gas thermometry and for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914936

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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



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