Apparatus for the Measurement of Isothermal and Adiabatic Compressibility of Gases up to 10 Kbar

MRS Proceedings ◽

10.1557/proc-22-69 ◽

1983 ◽

Vol 22 ◽

Author(s):

S.N. Biswas ◽

M.J.P. Muringer ◽

N.J. Trappeniers

Keyword(s):

Sound Velocity ◽

Adiabatic Compressibility ◽

Melting Line ◽

Velocity Measurements ◽

Ultrasonic Apparatus ◽

Gas Expansion ◽

Pulse Echo

ABSTRACTA pVT apparatus based on a combination of gas expansion and isochoric method and an ultrasonic apparatus for sound velocity measurements based on phase comparison pulse-echo technique have been developed for precise measurements of isothermal and adiabatic compressibility of gases at pressures up to 10 kbar and temperatures down to the melting line.

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Correction for transducer influence on sound velocity measurements by the pulse echo method

Ultrasonics ◽

10.1016/0041-624x(77)90010-5 ◽

1977 ◽

Vol 15 (1) ◽

pp. 30-32 ◽

Cited By ~ 50

Author(s):

E. Kittinger

Keyword(s):

Sound Velocity ◽

Velocity Measurements ◽

Pulse Echo ◽

Pulse Echo Method

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Experimental Investigations on Ultrasonic Velocity and Behavior of Thermodynamic Parameters of Four Members of nO.m Series

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.181-182.43 ◽

2011 ◽

Vol 181-182 ◽

pp. 43-46

Author(s):

D. Madhavi Latha ◽

V.G.K.M. Pisipati ◽

M. Ramakrishna Nanachara Rao ◽

P.V. Datta Prasad

Keyword(s):

Sound Velocity ◽

Ultrasonic Velocity ◽

Adiabatic Compressibility ◽

Experimental Investigations ◽

Velocity Measurements ◽

Acoustic Parameters ◽

Free Length ◽

Smectic A ◽

And Behavior ◽

Available Volume

Ultrasonic velocity measurements are carried out on fournOmcompounds viz., N-(p-n-methoxy and ethoxy benzylidene)-p-n-dodecyl and tetradecyl anilines, 1O.12, 1O.14, 2O.12 and 2O.14. The first three compounds exhibit mono variant nematic phase while the last compound exhibits nematic and smectic-A phases with variable thermal ranges. The temperature dependence of sound velocity, U shows minima at the isotropic-nematic and nematic-smectic-A transitions. In conjunction with the density data of these compounds, the thermo acoustic parameters such as adiabatic compressibility (βad), the molar sound velocity (Rao’s number) (Rn), molar compressibility (W), molecular free length (Lf) and available volume (Va) are estimated. In addition the intermolecular free length (Lf) is estimated in three different ways employing density and ultrasonic velocity data. The results are compared with the data available in literature of other compounds.

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