An equation of state for HFC-143a has been developed based on available experimental data. The equation of state presented here for HFC-143a is valid both in the superheated gaseous phase and compressed liquid phase at pressures up to 35 MPa, densities to 1327 kg/m(3), and temperatures from the triple point temperature of 161.34 K to 433 K. Correlations of the ideal gas heat capacity, vapor pressure and saturated liquid density are also presented. (C) 1998 Elsevier Science B.V. All rights reserved.