MODIFIED EQUATION OF STATE AND FORMULATION OF THERMODYNAMIC PROPERTIES OF XENON IN THE RANGE FROM 161. 36 TO 800 K AND 0 TO 350 MPa.

An equation is presented which describes the thermodynamic properties of liquid and gaseous xenon for temperatures from 161. 36 to 800 K and pressures up to 350 MPa. The coefficients of this equation have been developed by readjustment of the coefficients of a previous equation of state in order to fit experimental data published after 1972. The thermodynamic consistency was checked by comparison of free enthalpy of saturated liquid and vapor as well as by calculation of enthalpy of evaporation calculated by means of Clausius-Clapeyron equation and from the differences of enthalpies on the saturation line. A comparison of property values calculated from the equation of state with reliable experimental data proved that the deviations are practically within the limits of experimental errors. The standard deviation of calculated and reliable experimental pvT data is 0. 091%. The equation is very accurate in the critical region where the standard deviation from experiemntal data is only 0. 008%. The equation of state may be used for extrapolation in the region up to 800 K. The formulation is convenient for computer use in scientific and technological calculations; attached skeleton tables will serve for quick orientation in preparatory calculations.