function moleFraction import Chemical; extends Modelica.Icons.Function; input Modelica.Units.SI.ChemicalPotential u "Electro-chemical potential"; input Chemical.Interfaces.Definition definition "Definition of substance"; input Interfaces.SolutionState solution "Chemical solution state"; output Modelica.Media.Interfaces.Types.MoleFraction moleFraction "Mole fraction of the substance"; end moleFraction;