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.

THE FREEZING OF WATER IN FISH MUSCLE AND IN GELATIN

1932 ◽  
Vol 7 (2) ◽  
pp. 178-186 ◽  
Author(s):  
J. H. Mennie
Keyword(s):  
Heat Capacity ◽  
Freezing Point ◽  
Bound Water ◽  
Fish Muscle ◽  
Unfrozen Water ◽  
Capacity Curves ◽  
Calorimetric Measurements ◽  
Point Curve ◽  
Thermal Data ◽  
Heat Capacity Measurements

From the calorimetric measurements of Chipman and Langstroth (4) an estimate is made of the percentage of water frozen at temperatures down to − 20 °C. in samples of muscle from different species of fish. It is pointed out that if such measurements are to be used for the estimation of "bound" water, it must be known what portion of the water is kept from freezing by any inorganic salts that are present. Heat-capacity measurements on a 1.7% sodium chloride solution are given, and are shown to agree well with values calculated from available thermal data with the aid of the freezing-point curve. Heat-capacity curves for dry gelatin and 20, 40 and 66% gels are given. The unfrozen water in these gels at temperatures down to − 20 °C. is estimated and compared with results obtained by other methods.

HEAT CAPACITY MEASUREMENTS ON GELATIN GELS. I.

1932 ◽  
Vol 7 (2) ◽  
pp. 187-197 ◽  
Author(s):  
W. F. Hampton ◽  
J. H. Mennie
Keyword(s):  
Heat Capacity ◽  
Bound Water ◽  
Adiabatic Calorimeter ◽  
Calorimetric Measurements ◽  
Gelatin Gels ◽  
Heat Capacity Measurements ◽  
New Equation

Heat capacity measurements using an adiabatic calorimeter have been made on a 24% gel, on dry gelatin and on gelatin containing 12.5% water. The calculation of bound water from calorimetric measurements is discussed, and the limitations of the method used by previous workers indicated. A new equation is derived and an estimate of bound water in the 24% gel given. Further work is in progress.

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.

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.

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