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You searched on: Topic Area: Gas Metrology Sorted by: date

Displaying records 11 to 20 of 26 records.
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11. Reference measurements of Hydrogen's Dielectric Permittivity
Topic: Gas Metrology
Published: 8/10/2009
Authors: James W Schmidt, Michael R Moldover, Eric F. May
Abstract: We used a quasi-spherical cavity resonator to measure the relative dielectric permittivity {epsilon}^dr^ of H^d2^ at frequencies from 2.4 GHz to 7.3 GHz, at pressures up to 6.5 MPa, and at the temperatures 273 K and 293 K. The resonator was calibrat ...

12. High Definition Flow
Topic: Gas Metrology
Published: 8/1/2009
Authors: John D Wright, Michael R Moldover
Abstract: From pharmaceutical production to the natural gas market, exact flow measurements are critical. Here's how NIST helps keep us all on the same page.

13. The Electric And Magnetic Susceptibilities Of Gaseos Oxygen: Comparisons Of New Measurements and Modern Theory
Topic: Gas Metrology
Published: 9/25/2008
Authors: Michael R Moldover, E May, James W Schmidt
Abstract: We used a cross capacitor to measure the relative dielectric permittivity {epsilon}^dr^ of O^d2^ at 273 K, 293 K, and 323 K and at pressures up to 6.5 MPa. Simultaneously we measured oxygen's complex refractive index {I}n{/I} using a quasi-spheri ...

14. Natural Gas Flow Calibration Service
Series: Special Publication (NIST SP)
Topic: Gas Metrology
Published: 8/1/2008
Author: Aaron N Johnson
Abstract: This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine tur ...

15. Shear Thinning Near the Critical Point of Xenon
Topic: Gas Metrology
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 ...

16. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Topic: Gas Metrology
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 ...

17. The Polarizability of Helium and Gas Metrology
Topic: Gas Metrology
Published: 6/22/2007
Authors: James W Schmidt, R Gavioso, E May, Michael R Moldover
Abstract: Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability {I}A{/I}^d{epsilon}^ in the limit of zero density. We obtained ({I}A{/I}^d{epsilon},meas^ - {I}A{/I}^d{epsilon},theory^ ...

18. Gas Standards Containing Hydrocarbon and Volatile Organic Compounds for Automobile Exhaust and Ambient Air Monitoring
Topic: Gas Metrology
Published: 8/1/2003
Author: George C Rhoderick

19. Acoustic Measurements in Gases, Chapter 10
Topic: Gas Metrology
Published: 9/15/2001
Authors: Michael R Moldover, Keith A Gillis, John J. Hurly, J B. Mehl, J Wilhelm
Abstract: Cylindrical acoustic resonators developed at the National Institute of Standards and Technology (NIST) are routinely used to measure the speed of sound in gases with uncertainties of 0.01% or less. The pressure dependence of the data is fitted with ...

20. Development of Perfluorocarbon (PFC) Primary Standards for Monitoring of Emissions from Aluminum Production
Topic: Gas Metrology
Published: 8/1/2001
Authors: George C Rhoderick, Pamela M Chu, E. J. Dolin, J. Y. Marks, T. Howard, M. C. Lytle, L. G. McKenzie, D. Altman

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