Reaction index for formation of H2
function U2 extends Modelica.Icons.Function; input Modelica.SIunits.AbsolutePressure p "Pressure"; input Modelica.SIunits.Temperature T "Temperature"; input Modelica.SIunits.MoleFraction[4] moleFraction "Mole fractions"; output Real u "Reaction index for H2"; end U2;