speed of sound as function of density and temperature
function velocityOfSound_props_dT extends Modelica.Icons.Function; input Units.SI.Density d "density"; input Units.SI.Temperature T "temperature"; input ThermoSysPro.Properties.WaterSteam.Common.IF97BaseTwoPhase aux "auxiliary record"; output Units.SI.Velocity v_sound "speed of sound"; end velocityOfSound_props_dT;