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Displaying 126 - 148 of 148

Measurement of the ratio of the speed of sound to the speed of light

October 1, 1986
Author(s)
James B. Mehl, Michael R. Moldover
Measurements of the resonance frequencies of the acoustic modes and of the microwave modes of a single cavity can determine u/c, the ratio of the speed of sound of a gas to the speed of light. Such measurements with a monatomic gas would determine the

Viscometer for low frequency, low shear rate measurements

August 1, 1986
Author(s)
Robert F. Berg, Michael R. Moldover
We describe a torsion-oscillator viscometer whose low frequency ( 0.5 Hz) and very low shear rate (0.05 s-1) are required for measurements of shear sensitive fluids such as microemulsions, polymer melts and solutions gels, and liquid mixtures near critical

Viscosity measurements near a critical point using a novel torsion oscillator

May 1, 1986
Author(s)
Robert F. Berg, Michael R. Moldover
A torsion-oscillator viscometer has been constructed for the measurement of the viscosity of fluids near both liquid-vapor and liquid-liquid critical points. This viscometer has a resolution of ±0.2% and operates at a low frequency (0.6 Hz) and a very low

Wetting Layers and Dispersion Forces for a Fluid in Contact with a Vertical Wall

February 18, 1985
Author(s)
Richard F. Kayser, James W. Schmidt, Michael R. Moldover
When a liquid wets a vertical wall, wetting layers form on the wall high above the liquid-vapor meniscus. These layers are stabilized against gravity by dispersion forces. For SF_6 in contact with fused silica, we find layers between 20 and 40 nm thick in

Gravity effects in fluids near the gas liquid critical point

January 1, 1979
Author(s)
Michael R. Moldover, Jan V. Sengers, R W. Gammon, R Hocken
The presence of a gravitational field leads to both practical and fundamental limits of the resolution in critical phenomena experiments in fluids near the gas-liquid critical point. We present equations that yield estimates of the gravitational

Ising critical exponents in real fluids: An experiment

July 5, 1976
Author(s)
R Hocken, Michael R. Moldover
We report precise optical measurements of the equations of state of Xe, SF_6, and CO2 very near their critical points (|T - T_c|/T_c 5 x 10^-5). We find that the critical exponents of these fluids in this region are close to the exponents calculated from
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