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The vapor pressure of liquid and solid carbon dioxide

1933; Volume: 10; Issue: 3 Linguagem: Inglês

10.6028/jres.010.029

2376-9815

Cyril H. Meyers, M. S. Van Dusen,

Phase Equilibria and Thermodynamics

The vapor pressure of liquid carbon dioxide from the critical point (31.0°C.) to the triple point ( -56.60°C.)and the vapor pressure of the solid from the triple point to the normal sublimation point ( -78.515°C.)have been measuredwith an accuracy of 1 or 2 parts in 10,000.Equations have been obtained to represent these data, the average deviations from the equations being 1 part in 10,000 for the liquid and about 2 parts in 10,000 for the solid.The equation for the solid represents also the best work of other laboratories at and below -78°C .The vapor-pressure equation for the solid has been correlated with calorimetric data from other laboratories.Pressures and relative volumes have been observed along several isotherms in the critical region.A set of tables of the vapor pressure and the rate of change of vapor pressure with temperature calculated from the equations are given. CONTENTSPage I. Introduction 38 1 II.Preparation of samples 382 III.Description of apparatus and method 383 IV.Results of vapor-pressure measurements 385 V. Observations at the triple point 388 VI.Observations at the critical point 389 VII.Measurements by other observers 392 1. Observations at the triple point 392 2. Observations at the critical point 392 3 .Review of vapor-pressure measurements 394 VIII.Empirical representation of the data 399 1. Liquid carbon dioxide 399 2. Solid carbon dioxide 402 IX.Correlation of the vapor-pressure data with calorimetric data 404 X. Conclusions