diff --git a/src/thermophysicalModels/specie/specie/specie.C b/src/thermophysicalModels/specie/specie/specie.C
index 95807366..52799c4b 100644
--- a/src/thermophysicalModels/specie/specie/specie.C
+++ b/src/thermophysicalModels/specie/specie/specie.C
@@ -38,6 +38,12 @@ const Foam::scalar Foam::specie::Pstd = constant::standard::Pstd.value();
 //- Standard temperature (default in [K])
 const Foam::scalar Foam::specie::Tstd = constant::standard::Tstd.value();
 
+//- Elementary charge (default in [C])
+const Foam::scalar Foam::specie::e = constant::electromagnetic::e.value();
+
+//- Avogadro number (default in [1/mol])
+const Foam::scalar Foam::specie::NA = constant::physicoChemical::NA.value()*1000;
+
 namespace Foam
 {
 defineTypeNameAndDebug(specie, 0);
diff --git a/src/thermophysicalModels/specie/specie/specie.H b/src/thermophysicalModels/specie/specie/specie.H
index cb113e0f..3b1a4838 100644
--- a/src/thermophysicalModels/specie/specie/specie.H
+++ b/src/thermophysicalModels/specie/specie/specie.H
@@ -88,6 +88,12 @@ public:
             //- Standard temperature [K]
             static const scalar Tstd;
 
+            //- Elementary charge [C]
+            static const scalar e;
+
+            //- Avogadro number [1/kmol]
+            static const scalar NA;
+
 
     // Constructors