[components] Make molar mass constexpr where possible

dumux/material/components/air.hh

@@ -58,7 +58,7 @@ public:
      *
      * Taken from constrelair.hh.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 0.02896; /* [kg/mol] */ }
 
     /*!

dumux/material/components/benzene.hh

@@ -56,7 +56,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of benzene
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 0.07811; }
 
     /*!

dumux/material/components/brine.hh

@@ -71,7 +71,7 @@ public:
      *\param salinity The mass fraction of salt in brine
      * This assumes that the salt is pure NaCl.
      */
-   static Scalar molarMass(Scalar salinity = constantSalinity)
+   static constexpr Scalar molarMass(Scalar salinity = constantSalinity)
    {
        const Scalar M1 = H2O::molarMass();
        const Scalar M2 = Components::NaCl<Scalar>::molarMass(); // molar mass of NaCl [kg/mol]

dumux/material/components/cao.hh

@@ -56,7 +56,7 @@ public:
     /*!
      * \brief The molar mass of CaOH2 in \f$\mathrm{[kg/mol]}\f$.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     {
         return 56.0774e-3;
     }

dumux/material/components/cao2h2.hh

@@ -57,7 +57,7 @@ public:
     /*!
      * \brief The molar mass of CaOH2 in \f$\mathrm{[kg/mol]}\f$.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     {
         return 74.093e-3 ;
     }

dumux/material/components/ch4.hh

@@ -56,7 +56,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of molecular methane.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 16.043e-3; /* [kg/mol] */}
 
     /*!

dumux/material/components/co2.hh

@@ -68,7 +68,7 @@ public:
     /*!
      * \brief The mass in \f$\mathrm{[kg/mol]}\f$ of one mole of CO2.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 44e-3; /* [kg/mol] */ }
 
     /*!

dumux/material/components/granite.hh

@@ -61,7 +61,7 @@ public:
     /*!
      * \brief The molar mass of Siliciumoxide which is 70 % of granite in \f$\mathrm{[kg/mol]}\f$.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     {
         return 60.08e-3;
     }

dumux/material/components/h2.hh

@@ -57,7 +57,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of molecular hydrogen.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 2.01588e-3; }
 
     /*!

dumux/material/components/n2.hh

@@ -57,7 +57,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of molecular nitrogen.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 28.0134e-3;}
 
     /*!

dumux/material/components/nacl.hh

@@ -57,7 +57,7 @@ public:
     /*!
      * \brief The molar mass of NaCl in \f$\mathrm{[kg/mol]}\f$.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     {
         return 58.4428e-3 ;
     }

dumux/material/components/simpleh2o.hh

@@ -63,7 +63,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of water.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return 18e-3; }
 
     /*!

dumux/material/components/tabulatedcomponent.hh

@@ -158,7 +158,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of the component.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     { return RawComponent::molarMass(); }
 
     /*!

dumux/material/components/trichloroethene.hh

@@ -57,7 +57,7 @@ public:
     /*!
      * \brief The molar mass in \f$\mathrm{[kg/mol]}\f$ of TCE.
      */
-    static Scalar molarMass()
+    static constexpr Scalar molarMass()
     {
         return 131.39e-3; // [kg/mol]
     }