Determination of heats of vaporization and some other thermodynamic properties for four substituted hydrocarbons

1982 ◽  
Vol 47 (2) ◽  
pp. 543-549 ◽  
Author(s):  
Václav Svoboda ◽  
Vladimíra Charvátová ◽  
Vladimír Majer ◽  
Vladimír Hynek
Keyword(s):  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Constant Pressure ◽  
Pressure Curve ◽  
Saturated Vapour Pressure ◽  
Vapour Pressure Curve ◽  
The Difference ◽  
Cohesive Energies ◽  
Heats Of Vaporization

The temperature dependence of heats of vaporization and some other derived thermodynamic properties were determined for four substituted hydrocarbons, viz. 2,2,4-trimethylpentane,1-octene, ethylbenzene and n-butylbenzene. The temperature dependence of heats of vaporization was measured and, on the basis of these data, the values of standard heats of vaporization, internal and cohesive energies, entropies of vaporization and the difference of heat capacities of liquid and vapour at constant pressure and along the saturated vapour pressure curve were computed.

Determination of heats of vaporization and some other thermodynamic quantities for four alkylcycloparaffins

1981 ◽  
Vol 46 (12) ◽  
pp. 2983-2988 ◽  
Author(s):  
Václav Svoboda ◽  
Vladimíra Charvátová ◽  
Vladimír Majer ◽  
Jiří Pick
Keyword(s):  
Temperature Dependence ◽  
Constant Pressure ◽  
Heat Capacities ◽  
Saturation Line ◽  
Thermodynamic Quantities ◽  
Cohesive Energies ◽  
Heats Of Vaporization

Heats of vaporization and some other related thermodynamic quantities were determined for the four alkylcycloparaffins: ethylcyclopentane, n-butylcyclopentane, ethylcyclohexane and tert-butylcyclohexane. The temperature dependence of heats of vaporization was measured and employed for calculating standard heats of vaporization, internal and cohesive energies of vaporization, entropies of vaporization, and differences between heat capacities of liquids and vapours at constant pressure and along the saturation line of vapours.

Relation of the temperature derivative of heat of vaporization to the difference of heat capacities along the saturated vapour pressure curve

1981 ◽  
Vol 46 (10) ◽  
pp. 2446-2454
Author(s):  
Václav Svoboda ◽  
Zdeněk Wagner ◽  
Petr Voňka ◽  
Jiří Pick
Keyword(s):  
Heat Capacity ◽  
Vapour Pressure ◽  
Pressure Curve ◽  
Temperature Derivative ◽  
Heat Of Vaporization ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Vapour Pressure Curve ◽  
Pure Substances ◽  
The Difference

A method of calculating the heat capacity difference of liquid and its vapour along saturated vapour pressure curve is discussed. The qualitative course of this difference in dependence on temperature obtained from the data on the temperature dependence of heat of vaporization of pure substances is judged.

Determination of heats of vaporization and some other thermodynamic quantities for three fluorinated halogen ethanes

1981 ◽  
Vol 46 (4) ◽  
pp. 817-822 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Antonín Pošta ◽  
Jiří Pick
Keyword(s):  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Refractive Indices ◽  
Thermodynamic Quantities ◽  
Saturated Vapour ◽  
Two Temperatures ◽  
Heats Of Vaporization

Some thermodynamic properties were investigated for three fluorinated halogen ethanes: 1-bromo-2-chloro-1,1,2-trifluoroethane, 1,2-dibromotetrafluroethane and 1,2-dibromo-1-chlorotrifluoroethane. The temperature dependence of heats of vaporization, saturated vapour pressures, densities and refractive indices was measured at two temperatures. On the basis of the experimental quantities obtained, the standard heats of vaporization and the cohesive and internal energies of vaporization in their dependence on temperature were determined.

Temperature dependence of heats of vaporization, saturated vapour pressures and cohesive energies for a group of amines

1979 ◽  
Vol 44 (12) ◽  
pp. 3521-3528 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Josef Koubek ◽  
Jiří Pick
Keyword(s):  
Temperature Dependence ◽  
Saturated Vapour ◽  
Temperature Dependences ◽  
Experimental Values ◽  
Cohesive Energies ◽  
Heats Of Vaporization

The temperature dependences of heats of vaporization of propylamine, isopropylamine, butylamine, isobutylamine, sec-butylamine, cyclohexylamine, diethylamine and triethylamine and saturated vapour pressures of butylamine, isobutylamine, sec-butylamine and triethylamine were measured. The cohesive energies of amines studied in dependence on temperature were calculated from the experimental values.

Methodology for Measurement of Density of Liquid Oxides

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Jan Hrbek ◽  
Bence Mészáros ◽  
Mykhaylo Paukov ◽  
Martin Kudláč
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Extreme Conditions ◽  
Nuclear Accidents ◽  
System A ◽  
Different Temperatures ◽  
Density Values ◽  
Properties Of Materials ◽  
The Difference

Abstract Measurement of physical properties of materials in extreme conditions, such as high temperature, is limited by technological challenges. Nevertheless, modeling of several phenomena relies on the existence of experimental data for their validation. In this study, a method suitable for determination of density in a liquid phase at high temperature is proposed and tested on Al2O3–ZrO2 system. A methodology for acquiring the temperature dependence of density for radioactive materials is proposed and is aimed to refine severe nuclear accidents modeling. The oxide was melted in an induction furnace with a cold crucible. The measurement was based on evaluation of the volume of the melt at different temperatures, in a range from 2100 to 2400 °C. The densities of the oxide in the solid-state and the skull-layer were measured using a pycnometer. A temperature dependence of the density was established and the results were compared with literature. The difference between existing data and the measured values in this work was less than 5%. Thus, the proposed methodology provides reliable density values in extreme conditions.

scholarly journals Note on the boiling-point of sulphur

1908 ◽  
Vol 81 (548) ◽  
pp. 363-366 ◽  
Keyword(s):  
Boiling Point ◽  
Constant Pressure ◽  
Linear Expansion ◽  
Preceding Paper ◽  
Glass Tube ◽  
The Difference

As I have been partly to blame for the delay in the publication of the observations described in the preceding paper by Mr. N. Eumorfopoulos, it seems tight that I should make a brief statement, by way of apology, with regard to the object of the work and the causes which have led to the delay. The determination of the boiling-point of sulphur by Mr. E. H. Griffiths and myself in 1890 was made with the same air thermometer as that employed in my original experiments of 1887, and gave the same value for the difference-coefficient of the platinum thermometer. The result depended, however, on the scale of the constant-pressure air thermometer, and the correction for the expansion of the bulb was deduced from observations of the linear expansion over the range 0° to 500°C. of a piece of glass tube from which the bulb was made. Some uncertainty was introduced also by changes in the volume of the bulb at a temperature of 450°C.

Verification of the calculation of the constant-volume heat capacity difference of substances in the liquid and gas phases from the temperature dependence of heat of vaporization

1983 ◽  
Vol 48 (8) ◽  
pp. 2141-2146
Author(s):  
Věra Uchytilová ◽  
Václav Svoboda
Keyword(s):  
Heat Capacity ◽  
Temperature Dependence ◽  
Constant Volume ◽  
Heat Of Vaporization ◽  
Gas Phases ◽  
Volume Heat ◽  
Pure Substances ◽  
The Difference ◽  
Heats Of Vaporization ◽  
The Ideal

The possibilities were verified of the proposed method for calculating the difference between constant-volume heat capacities of liquids and gases in the ideal state from known data on the volumetric behaviour and temperature dependence of heats of vaporization of pure substances.

scholarly journals The determination of the vapour-pressure curve of liquid helium below 1.6° K using a magnetic thermometer

1941 ◽  
Vol 178 (972) ◽  
pp. 74-85 ◽  
Keyword(s):  
Liquid Helium ◽  
Vapour Pressure ◽  
Experimental Error ◽  
Theoretical Curve ◽  
Pressure Curve ◽  
Vapour Pressure Curve

The vapour-pressure curve of liquid helium below 1.6° K has been determined using the susceptibility of various paramagnetic salts as the thermometer. It is found that the results agree with the theoretical curve recently calculated by Bleaney and Simon to within the experimental error of 0.004° down to 1° K, and differ from the ‘scale 1937’ of Schmidt and Keesom, e.g. by 0.03° at 1° K.

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