Theory of Bose‐Einstein Fluids, Statistical Mechanical Treatment of the Thermodynamic Properties of Liquid Helium

1959 ◽  
Vol 31 (3) ◽  
pp. 814-829 ◽  
Author(s):  
Steingrimur Baldursson ◽  
Joseph E. Mayer ◽  
Henry Aroeste
Keyword(s):  
Thermodynamic Properties ◽  
Liquid Helium ◽  
Mechanical Treatment ◽  
Statistical Mechanical ◽  
Bose Einstein

Thermodynamic Properties of Liquid Helium Three. Vapor Pressures below 1°K

1957 ◽  
Vol 106 (2) ◽  
pp. 175-182 ◽  
Author(s):  
Stephen G. Sydoriak ◽  
Thomas R. Roberts
Keyword(s):  
Thermodynamic Properties ◽  
Liquid Helium ◽  
Vapor Pressures ◽  
Helium Three

Liquid helium and the properties of a Bose–Einstein gas. III. The density dependence of hard-core models

1970 ◽  
Vol 48 (11) ◽  
pp. 1340-1364
Author(s):  
D. F. Goble
Keyword(s):  
Density Dependence ◽  
Liquid Helium ◽  
Hard Core ◽  
Ladder Approximation ◽  
Model Systems ◽  
Coordinate Space ◽  
Core Boundary ◽  
T Matrix ◽  
Bose Einstein ◽  
Space Method

We have used the results of a previous paper by Goble and Trainor to compute the density dependence of the hard-core Bose–Einstein gas in the t-matrix ladder approximation, utilizing the coordinate-space method of Brueckner and Sawada as modified by Parry and ter Haar, and the pseudopotential treatment of the hard-core boundary condition presented by Liu and Wong. Various thermodynamic parameters of these model systems are compared with the properties of liquid helium four. The disagreements which are found are shown to be primarily related to differences in the magnitudes of the Landau parameters.

Thermodynamics of deuterium exchange reactions in water-amine and alcohol-amine systems

1981 ◽  
Vol 34 (9) ◽  
pp. 1801
Author(s):  
ZS Kooner ◽  
DV Fenby
Keyword(s):  
Thermodynamic Properties ◽  
Equilibrium Constant ◽  
Deuterium Exchange ◽  
Excess Enthalpies ◽  
Exchange Reactions ◽  
Molar Excess ◽  
Harmonic Frequencies ◽  
Statistical Mechanical

Vapour pressures and molar excess enthalpies at 298.15 K are reported for the systems H2O+(C2H5)2NH and D2O+(C2H5)2NH. They are analysed to give the equilibrium constant and enthalpy of the reaction ����������������� 2(C2H5)2NH(1)+D2O(1)→2(C2H5)2ND(1)+H2O(1) Molar excess enthalpies at 298.15 K of the systems CH3OH+(C2H5)2NH, CH3OD+(C2H5)2NH, C2H5OH+(C2H5)2NH and C2H5OD+(C2H5)2NH are used to obtain enthalpies of the reactions ���������� (C2H5)2NH(1)+ROD(1)→(C2H5)2ND(1)+ROH(1)� (R = CH3, C2H5)Thermodynamic properties of various NH/OD exchange reactions are calculated from statistical mechanical equations by use of harmonic frequencies.

The λ-Phenomenon of Liquid Helium and the Bose-Einstein Degeneracy

Nature ◽  
1938 ◽  
Vol 141 (3571) ◽  
pp. 643-644 ◽  
Author(s):  
F. LONDON
Keyword(s):  
Liquid Helium ◽  
Bose Einstein

Thermodynamic Properties of Dilute Solutions of Hydrogen in Glassy PD.80SI.20

1981 ◽  
Vol 8 ◽  
Author(s):  
R.S. Finocchiaro ◽  
C.L. Tsai ◽  
B.C. Giessen
Keyword(s):  
Thermodynamic Properties ◽  
Composition Range ◽  
Volumetric Method ◽  
Vapor Pressures ◽  
Free Energies ◽  
Positive Deviation ◽  
Dilute Solutions ◽  
Maximum Value ◽  
Statistical Mechanical ◽  
Partial Molar Enthalpies

ABSTRACTEquilibrium vapor pressures of dilute solutions of hydrogen in glassy Pd.80Si.20 have been measured from 10–90°C and at hydrogen pressures P of 1–100 torr. Under these conditions the ratio of hydrogen to alloy, x as determined by a volumetric method, reaches a maximum value of 0.0070. Over this range of x, the system exhibits a positive deviation from Sieverts' Law; isotherms were analyzed in terms of Lacher's modified statistical mechanical theory of hydrogen in palladium. The data were used to calculate relative partial molar enthalpies, excess entropies, and excess free energies for the formation of the solid solutions. The thermodynamic properties were found to vary with hydrogen content over the composition range studied.

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