Thermodynamic properties of binary mixtures containing thiaalkanes. II. Thermal pressure coefficients of pure compounds at 298.15 K

1979 ◽  
Vol 57 (23) ◽  
pp. 3135-3139
Author(s):  
R. Philippe ◽  
Z. Ferhat-Hamida ◽  
J. C. Merlin
Keyword(s):  
Thermodynamic Properties ◽  
Binary Mixtures ◽  
Pressure Coefficient ◽  
Experimental Results ◽  
Thermal Pressure ◽  
Pressure Coefficients ◽  
Pure Compounds

An apparatus for the measurement of thermal pressure coefficients of pure compounds is described. The thermal pressure coefficient β of n-thiaalkanes R2S (R = CH3, C2H5, n-C3H7, n-C4H9, n-C7H15) and of dithiaalkanes R2S2 (R = CH3, C2H5, iso-C3H7) were measured at 298.15 K and at zero pressure. These experimental results in conjunction with data from literature for other compounds are compared using the reduced parameter of pressure P* proposed by Flory. The P* do not have regular values for the lower members of thiaalkanes series. One explanation of these irregularities is the different size of the molecules.

Determination of the Equation of State of Polyisobutylene

1969 ◽  
Vol 42 (5) ◽  
pp. 1409-1411
Author(s):  
B. E. Eichinger ◽  
P. J. Flory
Keyword(s):  
Thermal Expansion ◽  
Equation Of State ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Pressure Coefficient ◽  
Experimental Results ◽  
Characteristic Parameters ◽  
Thermal Pressure

Abstract The density, thermal expansion coefficient, and thermal pressure coefficient for polyisobutylene of mol wt 40,000 have been accurately determined from 0 to 150°. Results are compared with the reduced equation of state employed in the theory of solutions. The characteristic parameters v*, T*, and p* required for the treatment of polyisobutylene solutions are obtained from the experimental results.

scholarly journals Thermodynamic properties of standard seawater

2009 ◽  
Vol 6 (1) ◽  
pp. 689-722 ◽  
Author(s):  
J. Safarov ◽  
F. Millero ◽  
R. Feistel ◽  
A. Heintz ◽  
E. Hassel
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Internal Pressure ◽  
Isothermal Compressibility ◽  
Pressure Coefficient ◽  
Standard Uncertainty ◽  
Volumetric Properties ◽  
Distilled Water ◽  
Thermal Pressure ◽  
Higher Temperature

Abstract. (p, ρ, T) data of standard seawater with practical salinity S≈35 (corresponding to an absolute salinity SA≈35.16504 g/kg) measured at T=(273.14 to 468.06) K and pressures up to p=140 MPa are reported with an estimated experimental relative combined standard uncertainty of 0.006% in density. The measurements were made with a newly constructed vibration-tube densimeter. The system was calibrated using double-distilled water, methanol and aqueous NaCl solutions. An empirical correlation for the density of standard seawater has been developed as a function of pressure and temperature. This equation of state was used to calculate other volumetric properties such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, internal pressure and secant bulk modulus. The results can be used to extend the present equation of state of seawater to higher temperature as a function of pressure.

scholarly journals Calculation of Thermal Pressure Coefficient of Lithium Fluid by pVT Data

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Vahid Moeini
Keyword(s):  
Statistical Mechanics ◽  
Pressure Coefficient ◽  
Pair Potential ◽  
Intermolecular Forces ◽  
Liquid Lithium ◽  
Thermal Pressure ◽  
X Ray ◽  
Pressure Coefficients ◽  
Pvt Data ◽  
Well Depth

For thermodynamic performance to be optimized, particular attention must be paid to the fluid’s thermal pressure coefficients and thermodynamics properties. A new analytical expression based on the statistical mechanics is derived for thermal pressure coefficients of dense fluids using the intermolecular forces theory to be valid for liquid lithium as well. The results are used to predict the parameters of some binary mixtures at different compositions and temperatures metal-nonmetal lithium fluid which agreement with experimental data. In this paper, we have used newly presented parameters of analytical expressions based on the statistical mechanics and predicted the metal-nonmetal transition for liquid lithium. The repulsion term of the effective pair potential for lithium shows well depth at 1600 K, and the position of well depth maximum is in agreement with X-ray diffraction and small-angle X-ray scattering.

scholarly journals Thermodynamic properties of standard seawater: extensions to high temperatures and pressures

Ocean Science ◽  
2009 ◽  
Vol 5 (3) ◽  
pp. 235-246 ◽  
Author(s):  
J. Safarov ◽  
F. Millero ◽  
R. Feistel ◽  
A. Heintz ◽  
E. Hassel
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Isothermal Compressibility ◽  
Pressure Coefficient ◽  
Volumetric Properties ◽  
Distilled Water ◽  
Thermal Pressure ◽  
Empirical Expression ◽  
Density Measurements ◽  
Average Percent Deviation

Abstract. Measurements of (p, ρ, T) properties of standard seawater with practical salinity S≈35, temperature T=(273.14 to 468.06) K and pressures, p, up to 140 MPa are reported with the reproducibility of the density measurements observed to be in the average percent deviation range Δρ/ρ=±(0.01 to 0.03)%. The measurements are made with a newly constructed vibration-tube densimeter which is calibrated using double-distilled water, methanol and aqueous NaCl solutions. Based on these and previous measurements, an empirical expression for the density of standard seawater has been developed as a function of pressure and temperature. This equation is used to calculate other volumetric properties including isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, the thermal pressure coefficient, internal pressure and the secant bulk modulus. The results can be used to extend the present equation of state of seawater to higher temperatures for pressure up to 140 MPa.

scholarly journals Calculation of Thermal Pressure Coefficient of R11, R13, R14, R22, R23, R32, R41, and R113 Refrigerants by pVT Data

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Vahid Moeini ◽  
Mahin Farzad
Keyword(s):  
Statistical Mechanics ◽  
Pressure Coefficient ◽  
Intermolecular Forces ◽  
Accurate Calculation ◽  
Thermal Pressure ◽  
Pressure Coefficients ◽  
First Order ◽  
Pvt Data ◽  
Thermodynamic Performance ◽  
Derivatives Of

For thermodynamic performance to be optimized particular attention must be paid to the fluid’s thermal pressure coefficients and thermodynamic properties. A new analytical expression based on the statistical mechanics is derived for R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants, using the intermolecular forces theory. In this paper, temperature dependency of the parameters of R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants to calculate thermal pressure coefficients in the form of first order has been developed to second and third orders and their temperature derivatives of new parameters are used to calculate thermal pressure coefficients. These problems have led us to try to establish a function for the accurate calculation of the thermal pressure coefficients of R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants based on statistical-mechanics theory for different refrigerants.

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