### 12.1.4. Using the IAPWS Equation of State

The IAPWS Equation of State is recommended for water calculations. For details, see IAPWS Equation of State in the CFX-Solver Theory Guide. There are several predefined IAPWS material definitions available for use, which differ only in the pressure and temperature ranges they cover. If you need to operate outside of these ranges, it is recommended that you choose one of the predefined materials and change the table generation details to cover the required range

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