COMPUTER PROGRAM FOR DETERMINATION OF THERMODYNAMIC PROPERTIES OF FLUIDS

The charts for reduced compressibility coefficients published in [1] have been completed by a table referring to a fluid of critical compressibility coefficient 0.302. The new table has been constructed using the data of helium. The isotherms have been divided into pressure intervals within which they have been described by maximum fourth order functions. The compressibility coefficients along the isobars have been then interpolated by quadratic functions of temperature. An additional requirement for the interpolation formulae was to yield a smooth inversion curve. The formulae can be used also for the calculation of fugacity coefficients and molar enthalpies. Two computer programs have been elaborated for these calculations