Thermodynamic properties of organic oxygen compounds XXXIII. The vapour pressure of acetone

1974 ◽  
Vol 6 (7) ◽  
pp. 693-700 ◽  
Author(s):  
D. Ambrose ◽  
C.H.S. Sprake ◽  
R. Townsend
Keyword(s):  
Thermodynamic Properties ◽  
Vapour Pressure

scholarly journals Evaporation of sulphate aerosols at low relative humidity

2016 ◽  
Author(s):  
Georgios Tsagkogeorgas ◽  
Pontus Roldin ◽  
Jonathan Duplissy ◽  
Linda Rondo ◽  
Jasmin Tröstl ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Thermodynamic Properties ◽  
Sulphuric Acid ◽  
Activity Coefficients ◽  
Vapour Pressure ◽  
Equilibrium Constants ◽  
Cloud Chamber ◽  
Aerosol Dynamics ◽  
Sulphate Aerosols

Abstract. Here we explore the vapour pressure of sulphuric acid at very low relative humidity, where evaporation of sulphuric acid from particles can be important in the atmospheres of Earth and Venus. We performed experiments in the CLOUD chamber at CERN forming sulphuric acid particles via nucleation and then measuring evaporation versus temperature and relative humidity. We modelled the experiments with the ADCHAM model to constrain the thermodynamic properties governing the evaporation of sulphuric acid. ADCHAM includes a thermodynamics module coupled to an aerosol dynamics module. We derived the mole fractions and activity coefficients of H2SO4, HSO4−, SO42− and SO3 in the particles and then simulated the condensation and evaporation of H2SO4 and SO3. We constrained the equilibrium constants for the dissociation of H2SO4 to HSO4− (KH2SO4) and the dehydration of H2SO4 to SO3 (xKSO3). Our results suggest that particle shrinkage is mainly governed by H2SO4 evaporation, however, we cannot dismiss a contribution from SO3 evaporation. We conclude that KH2SO4 = 2–4 ∙ 109 mol ∙ kg−1 at 288.8 ± 5 K and xKSO3 ≥ 1.4 ∙ 1010.

New Equations for the Thermodynamic Properties of Saturated Water in Both the Liquid and Vapour Phases

1967 ◽  
Vol 9 (1) ◽  
pp. 24-35 ◽  
Author(s):  
M. R. Gibson ◽  
E. A. Bruges
Keyword(s):  
Thermodynamic Properties ◽  
Chebyshev Polynomials ◽  
Vapour Pressure ◽  
Temperature Relationship ◽  
National Bureau ◽  
Tabular Form ◽  
Saturated Liquid ◽  
Saturated Water ◽  
First Time

Equations in the form of Chebyshev polynomials are presented which enable the thermodynamic properties of saturated water in its liquid and vapour phases to be calculated in a systematic manner. In the equations defining the pressure-temperature relationship the authors have made allowance for certain unpublished observations of the National Bureau of Standards and these are considered in the section relating to vapour pressure. It is believed that the assembly of equations specify for the first time the saturated liquid and vapour boundaries whose properties have previously only been available in tabular form.

scholarly journals Thermodynamic properties of the liquid Hg-Tl alloys determined from vapour pressure measurements

2002 ◽  
Vol 38 (3-4) ◽  
pp. 237-247 ◽  
Author(s):  
W. Gierlotka ◽  
K. Fitzner ◽  
M. Sukiennik
Keyword(s):  
Thermodynamic Properties ◽  
Activity Coefficients ◽  
Thermodynamic Functions ◽  
Vapour Pressure ◽  
Pressure Measurements ◽  
Temperature Range ◽  
Liquid Solutions ◽  
Partial Vapour Pressure

The partial vapour pressure of mercury over liquid Hg-Tl liquid solutions were determined in the temperature range from 450 to 700 K by direct vapour pressure measurements carried out with the quartz gauge. From the measured ln pHg vs. T relationships activities of mercury were determined. Using Redlich-Kister formulas logarithms of the activity coefficients were described with the following equations: From which all thermodynamic functions in the solutions can be derived.

Thermodynamic properties of the alkali metal hexachloroniobate and hexachlorotantalate compounds by vapour pressure measurements

1978 ◽  
Vol 56 (19) ◽  
pp. 2538-2545 ◽  
Author(s):  
Donald R. Sadoway ◽  
S. N. Flengas
Keyword(s):  
Thermodynamic Properties ◽  
Alkali Metal ◽  
Metal Cation ◽  
Vapour Pressure ◽  
Binary Systems ◽  
Alkali Metal Cation ◽  
Pressure Gauge ◽  
Pressure Measurements ◽  
Partial Pressures ◽  
Fused Quartz

The vapour pressures for the decomposition of the solid and liquid compounds AMCl6 where A = Na, K, Rb, or Cs, and M = Nb or Ta, were measured by a fused quartz Bourdon spiral pressure gauge. The hexachlorotantalates were found to be more stable thermally than the hexachloroniobates. Enthalpies of decomposition were calculated. The dissociation temperatures of each sequence of compounds increase with increasing size of the radius of the alkali-metal cation. Partial pressures of NbCl5 or TaCl5 vapour in equilibrium with solutions representing the binary Systems KCl–KNbCl6 and KCl–KTaCl6, respectively, are also reported.

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