A re-examination of the Eötvös equation

1981 ◽  
Vol 46 (8) ◽  
pp. 1930-1940 ◽  
Author(s):  
Otto Exner
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Temperature Dependence ◽  
Empirical Equation ◽  
Variable Temperature ◽  
Effective Equation ◽  
Fixed Temperature ◽  
Several Variables

The Eotvos equation (1) was re-examined from a purely empirical standpoint on a restricted but carefully selected set of compounds; the main intention was to test how an empirical equation of several variables can be verified by experiments. At a fixed temperature Eq. (1) is able to predict one of the three experimental quantities - surface tension, density, critical temperature - from the remaining two with a fair precision, but the range of validity as to the structure is rather restricted. At variable temperature and for a given compound, Eq. (1) describes the temperature dependence of surface tension provided the temperature dependence of density is known; however, the precision is low and a simpler and a more effective equation can be derived. If both temperature and structure are varied, Eq. (1) infers relationships of very low precision or even clearly invalid.

scholarly journals On the Temperature Dependence of Vaporization Enthalpy and its Correlation with Surface Tension.

2021 ◽  
Author(s):  
Amin Alibakhshi ◽  
Bernd Hartke
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Melting Point ◽  
Temperature Dependence ◽  
Wide Temperature Range ◽  
Thermophysical Properties ◽  
Vaporization Enthalpy ◽  
Temperature Range

Temperature dependence of vaporization enthalpy is one of the most important thermophysical properties of compounds. In the present study, we theoretically developed relationships applicable to evaluation of vaporization enthalpy of compounds from diverse chemical families for a wide temperature range from melting point to the critical temperature. One outcome of the proposed approach is a relationship describing the correlation between the surface tension and vaporization enthalpy which outperforms the extensively applied Kabo method proposed for the same purpose.<br>

Surface tension and heat of the surface formation of liquids

2020 ◽  
Vol 34 (31) ◽  
pp. 2050300
Author(s):  
E. A. Eyvazov ◽  
A. B. Ibrahimli
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Satisfactory Agreement ◽  
Research Work ◽  
Potential Method ◽  
Surface Tension Coefficient ◽  
Surface Formation ◽  
Experimental Values

By the potential method, it was determined that regardless of the nature of the liquid, the surface tension coefficient is determined by [Formula: see text]. In this expression, [Formula: see text] is the specific heat of the surface formation, [Formula: see text] is the critical temperature. According to our approach, the specific heat of the surface formation (SHS) also depends on temperature: [Formula: see text] ([Formula: see text] — the specific heat of the surface formation at the mealting temperature, [Formula: see text] — thermal coefficent of SHS). In this research work, the temperature dependence of the surface tension coefficient was calculated for seven dissimilar liquids. It was revealed that the calculated values of [Formula: see text] are in satisfactory agreement with the available experimental values.

scholarly journals Evaluation of the Temperature Dependence of Vaporization Enthalpy and its Correlation with Surface Tension by Machine Learning and Predictive Correlations

2021 ◽  
Author(s):  
Amin Alibakhshi ◽  
Bernd Hartke
Keyword(s):  
Machine Learning ◽  
Surface Tension ◽  
Critical Temperature ◽  
Melting Point ◽  
Temperature Dependence ◽  
Wide Temperature Range ◽  
Thermophysical Properties ◽  
Vaporization Enthalpy ◽  
Temperature Range

Temperature dependence of vaporization enthalpy is one of the most important thermophysical properties of compounds. In the present study, we theoretically developed relationships applicable to evaluation of vaporization enthalpy of compounds from diverse chemical families for a wide temperature range from melting point to the critical temperature. One outcome of the proposed approach is a relationship describing the correlation between the surface tension and vaporization enthalpy which outperforms the extensively applied Kabo method proposed for the same purpose.<br>

scholarly journals On the Temperature Dependence of Vaporization Enthalpy and its Correlation with Surface Tension

2021 ◽  
Author(s):  
Amin Alibakhshi ◽  
Bernd Hartke
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Melting Point ◽  
Temperature Dependence ◽  
Wide Temperature Range ◽  
Thermophysical Properties ◽  
Vaporization Enthalpy ◽  
Temperature Range

Temperature dependence of vaporization enthalpy is one of the most important thermophysical properties of compounds. In the present study, we theoretically developed relationships applicable to evaluation of vaporization enthalpy of compounds from diverse chemical families for a wide temperature range from melting point to the critical temperature. One outcome of the proposed approach is a relationship describing the correlation between the surface tension and vaporization enthalpy which outperforms the extensively applied Kabo method proposed for the same purpose.<br>

scholarly journals Evaluation of the Temperature Dependence of Vaporization Enthalpy and its Correlation with Surface Tension by Machine Learning and Predictive Correlations

2021 ◽  
Author(s):  
Amin Alibakhshi ◽  
Bernd Hartke
Keyword(s):  
Machine Learning ◽  
Surface Tension ◽  
Critical Temperature ◽  
Melting Point ◽  
Temperature Dependence ◽  
Wide Temperature Range ◽  
Thermophysical Properties ◽  
Vaporization Enthalpy ◽  
Temperature Range

Temperature dependence of vaporization enthalpy is one of the most important thermophysical properties of compounds. In the present study, we theoretically developed relationships applicable to evaluation of vaporization enthalpy of compounds from diverse chemical families for a wide temperature range from melting point to the critical temperature. One outcome of the proposed approach is a relationship describing the correlation between the surface tension and vaporization enthalpy which outperforms the extensively applied Kabo method proposed for the same purpose.<br>

scholarly journals Surface Tension and Density of Liquid Hot Work Tool Steel W360 by voestalpine BÖHLER Edelstahl GmbH & Co KG Measured with an Electromagnetic Levitation Apparatus

2020 ◽  
Vol 42 (2) ◽  
Author(s):  
Thomas Leitner ◽  
Anna Werkovits ◽  
Siegfried Kleber ◽  
Gernot Pottlacher
Keyword(s):  
Surface Tension ◽  
Temperature Dependence ◽  
Linear Model ◽  
Tool Steel ◽  
Pure Iron ◽  
Electromagnetic Levitation ◽  
Liquid Density ◽  
Hot Work Tool Steel ◽  
Significant Difference ◽  
Main Component

AbstractW360 is a hot work tool steel produced by voestalpine BÖHLER Edelstahl GmbH & Co KG, a special steel producer located in Styria, Austria. Surface tension and density of liquid W360 were studied as a function of temperature in a non-contact, containerless fashion using the oscillating drop method inside an electromagnetic levitation setup. For both, surface tension and density, a linear model was adapted to present the temperature dependence of these measures, including values for the uncertainties of the fit parameters found. The data obtained are compared to pure iron (with 91 wt% the main component of W360), showing an overlap for the liquid density while there is a significant difference in surface tension (− 5.8 % at the melting temperature of pure iron of 1811 K).

Raman Scattering Studies on Superconducting YBa2Cu3O7−x, Semiconducting YBa2Cu3O6+x, and Possible Impurity Phases

1987 ◽  
Vol 99 ◽  
Author(s):  
A. Mascarenhas ◽  
H. Katayama-Yoshlda ◽  
S. Geller ◽  
J. I. Pánkové ◽  
S. K. Debt
Keyword(s):  
Critical Temperature ◽  
Raman Scattering ◽  
Temperature Dependence ◽  
Phonon Mode ◽  
Group Analysis ◽  
Factor Group ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature ◽  
Mode Softening ◽  
Characteristic Lines

ABSTRACTA Raman spectroscopie investigation of specimens of superconducting YBa2Cu3O7−x and semiconducting YBa2Cu3O6+x indicates that in the range 100 to 700 cm-1, the characteristic lines of the superconductor at 13 K, are at 150, 338, 441, 507, 590, and 644 cm-1. Comparison of the Ranan spectra of the superconductor and the semiconductor indicates a mode stiffening of the pair at 338 and 441 cm-1, hut a mode softening of the pair at 507 and 590 cm-1. A factor group analysis leads to a tentative assignment of the Raman and infrared allowed modes. At temperatures 12K < T < 180K the Raman spectra of the superconductor indicate that the phonon mode at 338 cm-1 has an anomalous temperature dependence below the superconducting critical temperature (Tc).

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