Thermodynamic Properties of Hexafluoroacetone from 12°K to Its Normal Boiling Point. An Estimate of the Barrier to Internal Rotation from the Entropy of the Gas

1967 ◽  
Vol 47 (1) ◽  
pp. 44-48 ◽  
Author(s):  
A. C. Plaush ◽  
E. L. Pace
Keyword(s):  
Thermodynamic Properties ◽  
Internal Rotation ◽  
Boiling Point ◽  
Normal Boiling Point

Some Thermodynamic Properties of Pure and Impure Nitrogen

1974 ◽  
Vol 52 (16) ◽  
pp. 1521-1531 ◽  
Author(s):  
J. Ancsin
Keyword(s):  
Thermodynamic Properties ◽  
Triple Point ◽  
Boiling Point ◽  
Normal Boiling Point ◽  
Vapor Pressures ◽  
Freezing Points ◽  
Boiling Points ◽  
Triple Points

Boiling points, freezing points, and vapor pressures (from 56 K to the normal boiling point) for pure and various doped N2 samples have been measured. The normal boiling points for N2 and N2 doped with 100 v.p.p.m. of O2, Ar, Kr, and CO impurities were found to be 77.3439 K, 77.3458 K, 77.3452 K, 77.3454 K, and 77.3444 K respectively. The triple points of the same samples are 63.14635 K, 63.1445 K, 63.14575 K, 63.1487 K, and 63.14675 K respectively. The values obtained for the heats of sublimation, vaporization, and fusion at the triple point of pure N2 were 6773.8, 6049.6, and 724.3 J/mole respectively and the above impurities changed these quantities by the amounts given in Tables 5 and 6.

scholarly journals A Re-assessment of the Thermodynamic Properties of Osmium

2020 ◽  
Author(s):  
John W. Arblaster
Keyword(s):  
Liquid Phase ◽  
Thermodynamic Properties ◽  
Boiling Point ◽  
Enthalpy Of Fusion ◽  
Enthalpy Of Sublimation ◽  
Normal Boiling Point ◽  
Atmosphere Pressure

The thermodynamic properties were reviewed by the author in 1995. A new assessment of the enthalpy of fusion at 68.0 ± 1.7 kJ mol-1 leads to a revision of the thermodynamic properties of the liquid phase and although the enthalpy of sublimation at 298.15 K is retained as 788 ± 4 kJ mol-1 the normal boiling point is revised to 5565 K at one atmosphere pressure.

The Realization of the Normal Boiling Point of Neon

Metrologia ◽  
1978 ◽  
Vol 14 (1) ◽  
pp. 9-13 ◽  
Author(s):  
R C Kemp ◽  
W R G Kemp
Keyword(s):  
Boiling Point ◽  
Normal Boiling Point

Exciplex-Based Vapor/Liquid Visualization Systems Appropriate for Automotive Gasolines

1993 ◽  
Vol 47 (6) ◽  
pp. 782-786 ◽  
Author(s):  
Lynn A. Melton
Keyword(s):  
Cross Talk ◽  
Spectral Region ◽  
Boiling Point ◽  
Automotive Gasoline ◽  
Normal Boiling Point ◽  
Tertiary Amines ◽  
Temperature Range ◽  
Exciplex Emission ◽  
Visualization Systems ◽  
Vapor Liquid

This paper reports the development of exciplex-based vapor/liquid visualization systems based on exciplexes formed from tertiary amines and fluorine-substituted benzene and/or toluene. These systems are expected to be virtually coevaporative with solvents (fuels) boiling in the temperature range 70 to 110°C and thus are expected to track the vaporization of automotive gasoline effectively. A system consisting of 10% triethylamine/0.5% fluorobenzene/89.5% hexane should be coevaporative with a normal boiling point of 69°C. A system consisting of 10% n-propyldiethylamine/0.5% 4-fluorotoluene/89.5% isooctane should be coevaporative with a normal boiling point of approximately 100°C. Although the coevaporation of these systems is excellent, the exciplexes revert to varying extents to excited monomer at temperatures near 100°C. Thus there is considerable cross talk from the liquid into the vapor spectral region. The tertiary amines generally require excitation at wavelengths below 250 nm; the fluorobenzene or 4-fluorotoluene can be excited at 266 nm. Monomer emission peaks at 290 nm; exciplex emission peaks at 350 nm.

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