WOLFRAM SYSTEM MODELER
    ReferenceEnthalpyEnumeration defining the reference enthalpy of a medium  | 

SystemModel["Modelica.Media.Interfaces.Choices.ReferenceEnthalpy"]

| ZeroAt0K | 
         The enthalpy is 0 at 0 K (default), if the enthalpy of formation is excluded  | 
    
|---|---|
| ZeroAt25C | 
         The enthalpy is 0 at 25 degC, if the enthalpy of formation is excluded  | 
    
| UserDefined | 
         The user-defined reference enthalpy is used at 293.15 K (25 degC)  |