Comment on Sound Propagation in the Critical‐Temperature Region of Hydrogen Chloride

1963 ◽  
Vol 38 (7) ◽  
pp. 1785-1785 ◽  
Author(s):  
William Squire
Keyword(s):  
Critical Temperature ◽  
Hydrogen Chloride ◽  
Temperature Region ◽  
Sound Propagation

A STUDY OF THE COEXISTENCE OF THE LIQUID AND GASEOUS STATES OF AGGREGATION IN THE CRITICAL TEMPERATURE REGION. ETHYLENE

1940 ◽  
Vol 18b (4) ◽  
pp. 118-121 ◽  
Author(s):  
S. N. Naldrett ◽  
O. Maass
Keyword(s):  
Critical Temperature ◽  
Temperature Region ◽  
Previous Investigation ◽  
Coexistence Curve

The coexistence curve of ethylene has been determined in a manner similar to that described in a previous investigation on ethane (9). It is found to lie entirely within the coexistence curve determined by P-V-T methods by other investigators (6). This is considered to be evidence for the formation of a dispersion of liquid and vapour before the critical temperature is reached. The term "critical dispersion temperature" is suggested for the temperature at the apex of the coexistence curve determined by the disappearance of the meniscus in a bomb shaken in the manner described in this investigation. The apex of the curve determined by P-V-T methods is the true critical temperature, beyond which liquid is not stable. The classical critical temperature, determined by the disappearance of the meniscus in a stationary bomb, is an indefinite point between these two.

SOLUBILITY MEASUREMENTS IN THE REGION OF THE CRITICAL TEMPERATURE

1940 ◽  
Vol 18b (9) ◽  
pp. 293-304 ◽  
Author(s):  
C. H. Holder ◽  
O. Maass
Keyword(s):  
Critical Temperature ◽  
Temperature Region ◽  
Pressure Change ◽  
Liquid Phases

An apparatus for the measurement of solubility in the critical temperature region has been constructed. This apparatus permits samples to be taken from the upper and lower regions (vapour and liquid phases, if below critical temperature) of a system without volume or pressure change so that equilibrium is not disturbed.Solubility measurements of hexachloroethane in ethane have been made through the critical temperature region.

THE POLARIZATION OF LIQUIDS AND THEIR SATURATED VAPORS IN THE CRITICAL TEMPERATURE REGION

1936 ◽  
Vol 14b (3) ◽  
pp. 90-95
Author(s):  
J. Marsden ◽  
O. Maass
Keyword(s):  
Critical Temperature ◽  
Methyl Ether ◽  
Temperature Region ◽  
Room Temperature ◽  
Saturated Vapor ◽  
Dielectric Constants

The values of the so-called polarization of methyl ether (liquid and saturated vapor) and propylene (liquid and saturated vapor), from room temperature to the critical temperature, are given. In both liquids this polarization is independent of the temperature to within a few degrees of the critical temperature. Calculations show that the polarizations of a liquid and its saturated vapor may be equal above the critical temperature, even though the dielectric constants of the liquid and its saturated vapor, as well as their densities, are different.

Effect of pseudogap on the specific heat of superconductor

2015 ◽  
Vol 29 (24) ◽  
pp. 1550180 ◽  
Author(s):  
Thaipanya Chanpoom
Keyword(s):  
Critical Temperature ◽  
Specific Heat ◽  
Temperature Region ◽  
Analytic Form ◽  
Superconducting Gap ◽  
Crossover Temperature ◽  
Specific Heat Jump

In this paper, the superconductor with the competition of superconducting gap and pseudogap in the below crossover temperature region is calculated. The superconducting gap and pseudogap is assumed to arise from independent and competing correlation. The critical temperature, superconducting gap and the specific heat jump are derived in the analytic form and the approximation is used to simplify the equations obtained for the region that crossover temperature and energy of pseudogap are higher than critical temperature. We find that the critical temperature is decreased as the energy of pseudogap and crossover temperature as increased. The superconductor with pseudogap has small specific heat jump in comparison with the BCS value. Increasing the crossover temperature and critical temperature, the specific heat jump is decreased.

scholarly journals SOUND VELOCITY AND SOUND ABSORPTION IN THE CRITICAL TEMPERATURE REGION

1951 ◽  
Vol 29 (3) ◽  
pp. 243-252 ◽  
Author(s):  
W. G. Schneider
Keyword(s):  
Critical Temperature ◽  
Liquid Phase ◽  
Sound Velocity ◽  
Temperature Region ◽  
Temperature Range ◽  
Maximum Value ◽  
Increasing Temperature ◽  
Very High ◽  
High Absorption ◽  
Liquid And Vapor Phases

The velocity and absorption of ultrasound (600 kc.) has been measured throughout the critical temperature region of sulphur hexafluoride. Measurements were carried out for the coexisting liquid phase and vapor phase below Tc, and for the supercritical gas, and simultaneously, observations of the meniscus behavior in the neighborhood of Tc were made. The sound velocity for both liquid and vapor phases below Tc decreased with increasing temperature and became equal at Tc, the velocity at this point being 121.5 m. per sec. In the temperature range from 0.6° below Tc to Tc the velocity in the vapor was greater than that in the liquid. A very high absorption of sound was observed, having a maximum value at Tc and extending over a temperature range of approximately 1°. In the temperature range from Tc to 0.6° below Tc, the absorption in the liquid phase was greater than that in the vapour.

The Boson Field Analysis of the Critical Temperature Region in Ferromagnets

1977 ◽  
Vol 81 (1) ◽  
pp. 245-252 ◽  
Author(s):  
B. S. Tošić ◽  
M. M. Marinković ◽  
S. Berar
Keyword(s):  
Critical Temperature ◽  
Temperature Region ◽  
Field Analysis ◽  
Boson Field

A STUDY OF THE COEXISTENCE OF THE LIQUID AND GASEOUS STATES OF AGGREGATION IN THE CRITICAL TEMPERATURE REGION. ETHANE

1940 ◽  
Vol 18b (4) ◽  
pp. 103-117 ◽  
Author(s):  
S. G. Mason ◽  
S. N. Naldrett ◽  
O. Maass
Keyword(s):  
Critical Temperature ◽  
Temperature Region ◽  
Coexistence Curve ◽  
Absolute Temperature ◽  
Temperature Measurements ◽  
Careful Study ◽  
Physical Measurement ◽  
Relative Temperature ◽  
Density Measurements ◽  
Parabolic Shape

A careful study has been made of the position and nature of the meniscus and the distribution of opalescence in bombs containing ethane as the critical temperature is approached. Photographs of the phenomena have been made. The effect of shaking has been observed, and a type of shaking is described that is believed to hasten the attainment of equilibrium between the liquid and vapour phases. Using this type of stirring the coexistence curve of ethane has been determined. Relative temperature measurements are accurate to within ± 0.001 ° C.; absolute temperature measurements, to within ± 0.015 °C. Density measurements are believed accurate to within 1:3000. The limiting curve has the classical parabolic shape up to 32.23 °C., at which point the slope changes abruptly and the curve becomes flat along the density axis. The authors believe that at this temperature a dispersion of liquid and vapour occurs and that liquid still persists above this temperature. It is shown that the critical temperature as ordinarily determined in a stationary bomb cannot be accurately determined. The critical temperature can be determined precisely and without ambiguity when the bomb is shaken, and it is recommended that the value obtained in this way be used instead, as a physical measurement.

scholarly journals Effect of Bohm potential on a charged gas

Open Physics ◽  
2010 ◽  
Vol 8 (5) ◽  
Author(s):  
Domiziano Mostacci ◽  
Vincenzo Molinari ◽  
Francesco Pizzio
Keyword(s):  
Quantum Mechanics ◽  
Critical Temperature ◽  
Kinetic Equation ◽  
Sound Propagation ◽  
Quantum Gases ◽  
Interpretation Of Quantum Mechanics ◽  
Quantum Kinetic Equation ◽  
Zero Sound ◽  
Bohm Potential ◽  
Propagation Of Waves

AbstractBohm’s interpretation of Quantum Mechanics leads to the derivation of a Quantum Kinetic Equation (QKE): in the present work, propagation of waves in charged quantum gases is investigated starting from this QKE. Dispersion relations are derived for fully and weakly degenerate fermions and bosons (for the latter above critical temperature) and the differences discussed. Use of a kinetic equation permits investigation of “Landau-type” damping: it is found that the presence of damping in fermion gases is dependent upon the degree of degeneracy, whereas it is always present in boson gases. In fully degenerate fermions a phenomenon appears that is akin to the “zero sound” propagation.

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