# Analytical Representations of the Phase Equilibrium Curve of the Water–Vapor System

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### Abstract

A brief critical analysis of the theoretical *P*(*T*) liquid–vapor phase equilibrium curves is given. Based on the Clapeyron–Clausius equation and data on the heat capacity of water, a two-parameter expression of the *P*(*T*) curve is obtained for water in the temperature range from the triple point to 389 K. The parameters of the *P*(*T*) curve are determined from data on the pressure and heat of evaporation of water at the triple point. The accuracy of the *P*(*T*) function is comparable to the actual accuracy of standard thermodynamic tables for water and water vapor.

## Notes

## REFERENCES

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