scholarly journals (P,ρ,T) properties of 1-octyl-3-methylimidazolium tetrafluoroborate

2018 ◽  
Vol 83 (1) ◽  
pp. 61-73 ◽  
Author(s):  
Javid Safarov ◽  
Aygul Namazova ◽  
Astan Shahverdiyev ◽  
Egon Hassel
Keyword(s):  
Equation Of State ◽  
Speed Of Sound ◽  
Isothermal Compressibility ◽  
Constant Pressure ◽  
Pressure Coefficient ◽  
Heat Capacities ◽  
Thermal Pressure ◽  
Average Percent Deviation ◽  
Wide Range ◽  
Isentropic Exponent

(p,?,T) data of 1-octyl-3-methylimidazolium tetrafluoroborate [OMIM][BF4] over a wide range of temperatures, from 278.15 to 413.15 K, and pressures, p, up to 140 MPa are reported with an estimated ?0.01?0.08 % experimental relative average percent deviation (APD) in the density. The measurements were performed using an Anton Paar DMA HPM vibration tube densimeter. (p,?,T) Data for [OMIM][BF4] was fitted and the parameters of the applied equation were determined as a function of pressure and temperature. After a thorough analysis of literature values and validity of the used equation of state, various thermophysical properties, such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, internal pressure, heat capacities at constant pressure and volume, speed of sound and isentropic exponent at temperatures in the range 278.15?413.15 K and pressures p up to 140 MPa were calculated.

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 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.

Direct Measurement of the Thermal Pressure Coefficient of Water

1962 ◽  
Vol 15 (4) ◽  
pp. 740 ◽  
Author(s):  
GN Malcolm ◽  
GLD Ritchie
Keyword(s):  
Thermal Expansion ◽  
Satisfactory Agreement ◽  
Direct Measurement ◽  
Isothermal Compressibility ◽  
Pressure Coefficient ◽  
Constant Volume ◽  
Thermal Pressure ◽  
Wide Range ◽  
Temperature And Pressure

A constant volume thermometer has been used to measure the thermal pressure coefficient of water over a wide range of temperature and pressure. The results show satisfactory agreement with values calculated from the appropriate data for the coefficients of thermal expansion and isothermal compressibility of water.

scholarly journals Apparent molar volumes, Vф, of calcium acetate (Ca(Ch3COO)2(aq)) at 273.15 to 353.15 K and pressures up to 100 MPa

2018 ◽  
Vol 83 (9) ◽  
pp. 1005-1016
Author(s):  
Duygu Uysal-Ziraman ◽  
Javid Safarov ◽  
Özkan Doğan ◽  
Egon Hassel ◽  
Bekir Uysal
Keyword(s):  
Equation Of State ◽  
Pressure Coefficient ◽  
State Parameter ◽  
Calcium Acetate ◽  
Apparent Molar Volumes ◽  
Expanded Uncertainty ◽  
Thermal Pressure ◽  
Molar Volumes ◽  
Wide Range ◽  
Tube Density

Pressure, density and temperature (p, ?, T) data and apparent molar volumes, V?o, of aqueous calcium acetate solutions Ca(CH3COO)2(aq) over a wide range of temperatures from 273.15 to 353.15 K, pressures up to p = 100 MPa and molalities m, of 0.04918, 0.09367, 0.23797, 0.36365, 0.85923, 1.06930, 1.35223 and 1.81668 mol?kg-1 of Ca(CH3COO)2 are reported. The combined expanded uncertainty of the density (?) measurements at the 95 % confidence level with a coverage factor of k = 2 was estimated to be Uc(?) = ?0.3 kg?m?3. The measurements were realized with an Anton Paar DMA HPM vibration tube density meter. The system was calibrated using double-distilled water, aqueous NaCl solutions, methanol, toluene and acetone. An equation of state for fitting of the (p, ?, T) data of aqueous calcium acetate was developed as a function of pressure, temperature and molality. After a thorough analysis of literature values and validity of the constructed equation of state, various thermophysical properties, such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient and internal pressure at the investigated state parameter intervals were calculated.

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 The new equation for calculation the density of sea water from measurements of the speed of sound

2017 ◽  
pp. 12-18
Author(s):  
A. N. Grekov ◽  
◽  
N.A. Grekov ◽  
E.N. Sychov ◽  
◽  
...  
Keyword(s):  
Equation Of State ◽  
Sound Velocity ◽  
Speed Of Sound ◽  
Sea Water ◽  
High Accuracy ◽  
Wide Range ◽  
New Equation

In this work the new kind of the equation of state expressing the density of sea water through independent and in situ measurable parameters: temperature, pressure and sound velocity, is justified theoretically and implemented in practice. The novelty of the approach is that the use of sound velocity as one of the arguments makes it possible measuring of the density of sea water without measurements of salinity. The developed equation reproduces the density of sea water with a high accuracy in a wide range of parameters.

Equation of State and Thermodynamic Properties of Molten Potassium Chloride to 1320 K and 6 kbar

1976 ◽  
Vol 31 (7) ◽  
pp. 769-776 ◽  
Author(s):  
G. Goldmann ◽  
K. Tödheide
Keyword(s):  
Equation Of State ◽  
Potassium Chloride ◽  
Molten Salts ◽  
Isothermal Compressibility ◽  
Constant Pressure ◽  
Tait Equation ◽  
Density Data ◽  
Pvt Data ◽  
Simulation Results ◽  
Experimental Density

Abstract From the Tait equation an equation of state containing five adjustable parameters was developed which fits experimental density data of molten potassium chloride to 1320 K and 6 kbar with a standard deviation of 0.04%. The thermal expansion coefficient, isothermal compressibility, internal pressure, and molar heat capacities at constant pressure and constant volume were calculated as functions of pressure and temperature from the equation of state and were compared with computer simulation results. A method for an estimate of high-pressure PVT data for molten salts is suggested which yields results superior to the best computed data presently available.

Loci of maxima and minima of thermodynamic functions of a simple fluid

1976 ◽  
Vol 54 (12) ◽  
pp. 1282-1291 ◽  
Author(s):  
John Stephenson
Keyword(s):  
Specific Heat ◽  
Thermodynamic Functions ◽  
Speed Of Sound ◽  
Isothermal Compressibility ◽  
Constant Pressure ◽  
Van Der Waals ◽  
Experimental Results ◽  
Van Der Waals Equation ◽  
Simple Fluid ◽  
Fluid Argon

Some elementary properties of loci of extrema of thermodynamic functions are established and discussed in connection with maxima and minima of the constant volume specific heat, CV, the isothermal compressibility, χT, and the constant pressure specific heat, CP, along isotherms, and the extremum properties of the isobaric coefficient of expansion, αP, along isobars. Experimental results for fluid argon are used to construct the required loci of extrema. Van der Waals' equation is applied to obtain loci of extrema for χT, CP, and αP, for the speed of sound W, and for related inflexion loci.

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