Source formulation of the WaterSteamPro

Source formulation for the WaterSteamPro's thermodynamic properties is a new formulation for the thermodynamic properties of water and steam for industrial use from the International Association for the Properties of Water and Steam (www.iapws.org). This new industrial standard is called "IAPWS Industrial Formulation for the Thermodynamic Properties of Water and Steam" (IAPWS-IF97). The formulation IAPWS-IF97 replaces the previous industrial standard IFC-67.