HS-diagram is a handy toolbox of steam table, calculates general thermodynamic and transport properties of water and steam of IAPWS IF97 Main features:- Locates calculated results (cycles, processes) (point locations) on the charts (diagram). - Interactive chart - ability to build processes in HS-diagram- State Properties: pressure, temperature, specific volume, specific enthalpy and specific entropy etc (19 elements).The range of validity confined by pressure and temperature for general properties is compliant to the definition in the release of IAPWS IF97.