Vapor presssure

Product Category Stage3 Vapor Presssure Water Solubility Special Considerations... 

Vapor presssure equations for the crystal (o, 6) and the liquid to gas are given. 

When vapor pressure equals local atmospheric pressure, a compound boils. Solids also have a vapor presssure. The melting point is the temperature at which the vapor pressures of the solid is equal to the vapor pressure of the liquid. Above the melting point the liquid vapor pressure is greater than that of the solid below the melting point the liquid vapor pressure is less than that of the solid. 

DAR/MCC] Darnell, A. J., McCollum, W. A., High temperature reactions of thorium and thoria and the vapor presssure of thoria. Atomics International, Report NAA-SR-6498, (1961). Cited on pages 113, 120,... 

In a solution containing several in volatile solutes, the vapor pressure lowering depends on the sum of the mole fractions of the various solutes. Note particularly that it does not depend on the kinds of solutes present, except that they be involatile. The vapor presssure depends only on the relative numbers of solute molecules. 

If no experimental data are available, bubble pressures and vapor mole fractions are calculated over the liquid mole fraction range of x = 0 to 1 at intervals of 0.1. In this mode no data are entered to, or accessed from, the disk. Instead, the user provides critical temperature, critical presssure, the acentric factor and PRSV a pai ameter for each pure component, and temperature. The program then returns... 

For the experimental investigation of compressibility of superheated and saturated vapors, the method of the constant-volume nonballasted piezometer was employed. The fundamental variables (pressure, temperature, and mass of the substance) were measured with instruments of the same class as those used in the work of MEI. The distinguishing feature of the piezometric rig was the use of a membrane zero indicator of pressure of the electrocontact type. The sensitivity of this instrument reached 1 mm water column, but the zero point drifted by 10 mm water column. The authors in Refs. [2.19, 2.21] evaluated the scatter of experimental points on the saturation curve as 0.4% for pressure, and the repeatability of presssure during the forward and reverse tracing along the constant-volume lines was 0.15%. 

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