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Displaying records 21 to 24.
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21. The Calculation of Natural Gas Viscosity
Topic: Gas Metrology
Published: 8/14/2009
Authors: Aaron N Johnson, William Johansen
Abstract: The calculation of natural gas viscosity has been implemented many different ways including the use of constants. Different methods of calculating natural gas viscosity may produce values with differences as large as 50%. Increasing natural gas price ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903462

22. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832266

23. 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^ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830993

24. ,WeighingŠ a Gas With Microwave and Acoustic Resonances
Topic: Gas Metrology
Published: 12/9/2013
Authors: Keith A Gillis, James B. Mehl, James W Schmidt, Michael R Moldover
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I}of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel (,tankŠ) with a relative uncertainty of {I}u{/I}^dr^({I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917698



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