OpenFOAM-12/applications/test/thermoMixture/thermoDict

specie1
{
   specie
   {
      nMoles 1;
      molWeight 1;
   }

   thermodynamics
   {
      Cp 1;
      Cv 1;
      Hf 0;
   }

   transport
   {
      mu 1;
      Pr 1;
   }
}

specie2
{
   specie
   {
      nMoles 1;
      molWeight 0.5;
   }

   thermodynamics
   {
      Cp 2;
      Cv 2;
      Hf 0;
   }

   transport
   {
      mu 1;
      Pr 1;
   }
}