.ThermoSysPro.Properties.WaterSteam.IF97_Utilities.AnalyticDerivatives.surfaceTension .ThermoSysPro.Properties.WaterSteam.IF97_Utilities.AnalyticDerivatives.surfaceTensionfunction surfaceTension = ThermoSysPro.Properties.WaterSteam.BaseIF97.Transport.surfaceTension;