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A four-ring, toroidal cross capacitor was used to measure accurately the relative dielectric permittivity e(p, T) of He, Ar, N2, O2, CH 4, C2H 6, C3H8, and CO2. (e is often called the â€˜â€˜dielectricâ€¦ (More)

We review the principles, techniques and results from primary acoustic gas thermometry (AGT). Since the establishment of ITS-90, the International Temperature Scale of 1990, spherical andâ€¦ (More)

- M. R. Moldover, John W. Cahn
- Science
- 1980

When two fluid phases are near a critical point, one of them will be excluded from contact with any third phase that happens to be present by a wetting film of the other critical phase. A simple andâ€¦ (More)

- J. W. Schmidt, Roberto M. Gavioso, Elizabeth May, M. R. Moldover
- Physical review letters
- 2007

Using a quasispherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A(epsilon) in the limit of zero density. We obtained (A(epsilon,meas)â€¦ (More)

National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 We measured the acoustic resonance frequencies of an argon-filled spherical cavity and the microwave resonance frequenciesâ€¦ (More)

- Reinier F. van den Berg, M. R. Moldover, Gregory A. Zimmerli
- Physical review. E, Statistical physics, plasmasâ€¦
- 1999

We used a novel, overdamped oscillator aboard the Space Shuttle to measure the viscosity eta of xenon near its critical density rho(c) and temperature Tc. In microgravity, useful data were obtainedâ€¦ (More)

- Keith A. Gillis, Iosif I. Shinder, M. R. Moldover
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2005

We deduce the thermophysical properties of near-critical xenon from measurements of the frequencies and half-widths of the acoustic resonances of xenon maintained at its critical density inâ€¦ (More)

- Keith A. Gillis, Iosif I. Shinder, M. R. Moldover
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2004

We measure and calculate the sound attenuation within thermoacoustic boundary layers between solid surfaces and xenon at its critical density rhoc as the reduced temperature tau identical with (T-â€¦ (More)

- Xinyu Feng, J. T. Zhang, +5 authors Yini Duan
- Metrologia
- 2017

We report a new determination of the Boltzmann constant kB using a cylindrical acoustic gas thermometer. We determined the length of the copper cavity from measurements of its microwave resonanceâ€¦ (More)

This paper identi es a new mechanism that can a ect the discharge coe cient of critical nozzle ows. Speci cally, vibrational relaxation e ects are demonstrated to signi cantly inuence the dischargeâ€¦ (More)