EQUATIONS OF STATE VALID CONTINUOUSLY FROM ZERO TO EXTREME PRESSURES FOR H2O AND CO2

A new form of equation of state is proposed for use over extremely wid e ranges of pressure where conventional equations fail. In particular, fluids including H2O and CO2 as well as argon, etc., remain more comp ressible at very high densities than can be represented by typical equ ations with van der Waals or Carnahan and Starling repulsive terms. Th e new equation is fitted to the data for H2O and CO2 over the entire r ange from the vapor and Liquid below the critical temperature to at le ast 2000 K and from zero pressure to more than 10(5) bar (10 GPa) with good agreement. The extension of the equation for mixed fluids is dis cussed.