Velocity of sound isotherms in liquid krypton and xenon

1968 ◽  
Vol 46 (22) ◽  
pp. 3477-3482 ◽  
Author(s):  
C. C. Lim ◽  
D. H. Bowman ◽  
Ronald A. Aziz
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Experimental Error ◽  
Corresponding States ◽  
Suitable Choice ◽  
Velocity Of Sound ◽  
Molecular Parameters ◽  
Triple Points ◽  
Atomic Radii

The velocity of sound was measured with a precision of 0.1% in liquid krypton and xenon at pressures between the vapor pressure and about 65 atm, from near their triple points to near their critical points.A corresponding states treatment of these measurements and previous results in argon showed that, with a suitable choice of relative molecular parameters (σ,ε), the W*(P*,T*) surfaces were coincident to within the experimental error, except for argon near the critical temperature.The relative values of the effective atomic radii σ obtained from this analysis were somewhat lower than those obtained from other thermodynamic properties.

Third virial coefficients of mixtures of gases

1968 ◽  
Vol 21 (3) ◽  
pp. 565 ◽  
Author(s):  
JT McHenry
Keyword(s):  
Experimental Error ◽  
Virial Coefficients ◽  
Corresponding States

For gases whose molecules are not greatly different in size and have spherical or almost spherical fields of force and whose third virial coefficients are describable by the principle of corresponding states, it is shown that, with the help of this principle and within the present rather large limits of experimental error, the following combining rules : (see article for formula)'

Concerning the Alleged Absorption of Gaseous Nitrogen by Benzene Solutions of Rubber and Gutta-Percha Hydrocarbons

1937 ◽  
Vol 10 (2) ◽  
pp. 254-254
Author(s):  
Louis B. Howard ◽  
Guido E. Hilbert
Keyword(s):  
Vapor Pressure ◽  
Experimental Error ◽  
Barometric Pressure ◽  
Heating Effect ◽  
Gaseous Nitrogen ◽  
Direct Sunlight ◽  
Nitrogen Gas ◽  
Experimental Procedure ◽  
Gutta Percha ◽  
Practical Standpoint

Abstract Experiments described by de Jong have been interpreted as indicating that dilute benzene solutions of rubber or gutta-percha hydrocarbon from sheet balata, when exposed to sunlight for a few days in either quartz or ordinary glass vessels, absorb gaseous nitrogen in appreciable amounts. If such a photochemical combination of rubber and nitrogen actually occurs, one might reasonably expect other unsaturated hydrocarbons containing isoprene units such as carotene and xanthophyll to behave similarly. These substances which always are found closely associated with chlorophyll in green plants possess physiological functions which, as yet, remain quite obscure. It therefore seemed of very great importance from both a theoretical and a practical standpoint to attempt to confirm these results of de Jong. In the present study the experimental procedure of the original investigation was followed as closely as the description of the work allowed. Several variable factors, such as temperature, barometric pressure, vapor pressure of the benzene solutions, and the heating effect of sealing the tubes, were controlled. In one experiment Pyrex tubes of 150-cc, capacity were filled with 100 cc. of nitrogen gas and 50 cc. of benzene solutions containing about 0.5% of either pale crepe rubber or balata. After sealing, these tubes and a benzene control were exposed to direct sunlight during the summer for various lengths of time up to five weeks. At the end of the tests the changes in volume of the nitrogen in the tubes containing the rubber solutions differed from that of the benzene control by a maximum of 0.5 cc. which was found to be about the limit of experimental error.

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