ESDU 89020 tabulates in SI units from the melting point to the critical point along the saturation line at fixed pressures data for: saturation temperature@ liquid density@ vapour specific volume@ liquid and vapour enthalpy and entropy@ latent heat of vaporisation and specific heat capacity. In addition@ tables give along specific isobars for pressures up to 50 MN/sq m the variation with temperature for the vapour of specific volume@ compression factor@ enthalpy@ entropy@ and specific heat capacities at constant pressure and volume. The data were generated from a single correlating function fitting selected experimental data drawn from the literature@ and are therefore self-consistent. An estimate of the error in linear interpolation within the tables is included@ and a computer- generated temperature-enthalpy chart representing the data is provided. To facilitate use of the data in British units@ conversion factors are given. No equations for the values are included.