scholarly journals Theory of Heat Capacity of Liquid Helium-4 for Temperatures above the Critical Point

2012 ◽  
Vol 57 (12) ◽  
pp. 1214
Author(s):  
I.O. Vakarchuk ◽  
V.S. Pastukhov ◽  
R.O. Prytula
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Critical Point ◽  
Effective Mass ◽  
Liquid Helium ◽  
Internal Energy ◽  
Simple Calculation ◽  
Entire Temperature Range ◽  
Temperature Range ◽  
Helium 4

We analyze numerically the behavior of the heat capacity of liquid 4He for the entire temperature range with the corresponding formula for the internal energy obtained in Ref. [I.O. Vakarchuk, R.O. Prytula, A.A. Rovenchak, J. Phys. Stud. 11, 259 (2007)] combined with a simple calculation of the effective mass of interacting Bose particles. The results agree quite well with experimental data.

HEAT CAPACITY MEASUREMENTS ON GELATIN GELS. II.

1934 ◽  
Vol 10 (4) ◽  
pp. 452-462 ◽  
Author(s):  
W. F. Hampton ◽  
J. H. Mennie
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Heat Effect ◽  
Freezing Point ◽  
Temperature Range ◽  
Calorimetric Measurements ◽  
Gelatin Gels ◽  
Heat Capacity Measurements

Measurements of the heat capacity of gelatin gels, prepared from ash-free, electric gelatin, have been extended to cover the temperature range between − 180° and 25 °C. and the concentration range from 9 to 100% gelatin. Change in the temperature of the gel above the freezing point is found to be accompanied by a heat effect which has not previously been taken into account in calorimetric measurements on gels and which renders the interpretation of the experimental data uncertain.

AB INITIO THERMODYNAMICS OF ZINC-BLENDE ZnS, ZnSe

2011 ◽  
Vol 25 (32) ◽  
pp. 4553-4561 ◽  
Author(s):  
HUAN-YOU WANG ◽  
HUI XU ◽  
JU-YING CAO ◽  
MING-JUN LI
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Constant Pressure ◽  
Local Density ◽  
Linear Thermal Expansion ◽  
Plane Wave Method ◽  
Temperature Range ◽  
Zinc Blende ◽  
Good Agreement

The density function perturbation theory (DFPT) is employed to study the linear thermal expansion and heat capacity at constant pressure (with the quasiharmonic approximation). The calculations are performed using a pseudopotential plane wave method and local density approximation for the exchange-correlation potential. The calculated results of linear thermal expansion coefficient and heat capacity at constant pressure for zinc-blende ZnS , ZnSe are compared with the available experimental data in a wide temperature range. Generally, in low-temperature range, they have good agreement. However, in high-temperature range, due to anharmonic effect and other reasons, lead to larger errors for these properties between the theoretical results and available experimental data.

Ideal–Gas Thermochemical Properties for Alkanolamine and Related Species Involved in Carbon Capture Applications

2020 ◽  
Author(s):  
Nayyereh hatefi ◽  
William Smith
Keyword(s):  
Heat Capacity ◽  
Electronic Structure ◽  
Co2 Capture ◽  
Carbon Capture ◽  
Ideal Gas ◽  
Thermochemical Properties ◽  
Temperature Range ◽  
Comparison Results ◽  
Electronic Structure Methods ◽  
Protonated Forms

<div>Ideal{gas thermochemical properties (enthalpy, entropy, Gibbs energy, and heat capacity, Cp) of 49 alkanolamines potentially suitable for CO2 capture applications and their carbamate and protonated forms were calculated using two high{order electronic structure methods, G4 and G3B3 (or G3//B3LYP). We also calculate for comparison results from the commonly used B3LYP/aug-cc-pVTZ method. This data is useful for the construction of molecular{based thermodynamic models of CO2 capture processes involving these species. The Cp data for each species over the temperature range 200 K{1500 K is presented as functions of temperature in the form of NASA seven-term polynomial expressions, permitting the set of thermochemical properties to be calculated over this temperature range. The accuracy of the G3B3 and G4 results is estimated to be 1 kcal/mol and the B3LYP/aug-cc-pVTZ results are of nferior quality..</div>

Experimental Data and Modeling of Solution Density and Heat Capacity in the Na–K–Ca–Mg–Cl–H2O System up to 353.15 K and 5 mol·kg–1Ionic Strength

2017 ◽  
Vol 62 (10) ◽  
pp. 3561-3576 ◽  
Author(s):  
Adeline Lach ◽  
Karine Ballerat-Busserolles ◽  
Laurent André ◽  
Mickaël Simond ◽  
Arnault Lassin ◽  
...  
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Solution Density

Heat capacity of Tm2Cu2O5 in the temperature range 431–1004 K

2014 ◽  
Vol 56 (2) ◽  
pp. 420-422
Author(s):  
V. M. Denisov ◽  
L. T. Denisova ◽  
L. G. Chumilina ◽  
S. D. Kirik
Keyword(s):  
Heat Capacity ◽  
Temperature Range
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