Thermochemical Relations for Water at High Temperatures and Pressures

by R. A. Papetti, Misako C. Fujisaki

Purchase Print Copy

 FormatList Price Price
Add to Cart Paperback46 pages $23.00 $18.40 20% Web Discount

A compilation of the equations and data necessary to determine the equations of state and equilibrium composition of a dense mixture of chemically reacting gases. Emphasis is on the thermodynamic regions that could be attained by this mixture upon subjecting water to a nuclear burst. At present, there are no adequate experimental data to explain the thermodynamic equilibrium properties of water at very high pressure and temperature, and no reliable methods exist to determine the correct functional forms for mixtures of polar and nonpolar molecules, ions, and free radicals at close separations and high temperatures. Using the approach of chemical thermodynamics, the study presents methods for determining the pressure, internal energy, entropy, Helmholtz free energy, chemical potential, and composition as functions of the temperature and volume of the gas mixture. These should be regarded as interpolation procedures that smoothly join results in other regions that are covered by experimental data or adequate physical theories.

This report is part of the RAND Corporation Research memorandum series. The Research Memorandum was a product of the RAND Corporation from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

Our mission to help improve policy and decisionmaking through research and analysis is enabled through our core values of quality and objectivity and our unwavering commitment to the highest level of integrity and ethical behavior. To help ensure our research and analysis are rigorous, objective, and nonpartisan, we subject our research publications to a robust and exacting quality-assurance process; avoid both the appearance and reality of financial and other conflicts of interest through staff training, project screening, and a policy of mandatory disclosure; and pursue transparency in our research engagements through our commitment to the open publication of our research findings and recommendations, disclosure of the source of funding of published research, and policies to ensure intellectual independence. For more information, visit

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.