diff --git a/MaterialLib/MPL/Properties/ClausiusClapeyron.h b/MaterialLib/MPL/Properties/ClausiusClapeyron.h
index c609012dc4bcb2980dff3219335b4b4ff35584d0..d1db8b0ed37818713686bf6f8f5c8f5053f03877 100644
--- a/MaterialLib/MPL/Properties/ClausiusClapeyron.h
+++ b/MaterialLib/MPL/Properties/ClausiusClapeyron.h
@@ -21,10 +21,10 @@ class Medium;
 class Phase;
 class Component;
 /**
- * Vapor pressure as function of temperature based on Clausius-Clapeyron
+ * Vapour pressure as function of temperature based on Clausius-Clapeyron
  * equation.
  * This property must be either a phase or a component
- * property, it computes the saturation vapor pressure of a substance
+ * property, it computes the saturation vapour pressure of a substance
  */
 class ClausiusClapeyron final : public Property
 {
diff --git a/MaterialLib/MPL/PropertyType.h b/MaterialLib/MPL/PropertyType.h
index df1ad092308d0b51c6dd1f742794a8a385b87e32..6fa0e4e2ce6138877653439380beeade7127357e 100644
--- a/MaterialLib/MPL/PropertyType.h
+++ b/MaterialLib/MPL/PropertyType.h
@@ -94,7 +94,7 @@ enum PropertyType : int
     transport_porosity,
     /// used to compute the hydrodynamic dispersion tensor.
     transversal_dispersivity,
-    vapor_pressure,
+    vapour_pressure,
     vapour_density,
     vapour_diffusion,
     viscosity,
@@ -317,9 +317,9 @@ inline PropertyType convertStringToProperty(std::string const& inString)
     {
         return PropertyType::transversal_dispersivity;
     }
-    if (boost::iequals(inString, "vapor_pressure"))
+    if (boost::iequals(inString, "vapour_pressure"))
     {
-        return PropertyType::vapor_pressure;
+        return PropertyType::vapour_pressure;
     }
     if (boost::iequals(inString, "vapour_density"))
     {
@@ -399,7 +399,7 @@ static const std::array<std::string, PropertyType::number_of_properties>
                              "thermal_transversal_dispersivity",
                              "transport_porosity",
                              "transversal_dispersivity",
-                             "vapor_pressure",
+                             "vapour_pressure",
                              "vapour_density",
                              "vapour_diffusion",
                              "viscosity",
diff --git a/Tests/MaterialLib/TestMPLClausiusClapeyron.cpp b/Tests/MaterialLib/TestMPLClausiusClapeyron.cpp
index 1c26bf8f5356f44454b951919db4ec43e2579a2e..ea442f0df680a19bdc05e9b3fef7a4ab7c10ac5b 100644
--- a/Tests/MaterialLib/TestMPLClausiusClapeyron.cpp
+++ b/Tests/MaterialLib/TestMPLClausiusClapeyron.cpp
@@ -56,7 +56,7 @@ std::stringstream config(const double molar_mass,
     m << "         </independent_variable>\n";
     m << " </property>\n";
     m << "                        <property>\n";
-    m << "                            <name>vapor_pressure</name>\n";
+    m << "                            <name>vapour_pressure</name>\n";
     m << "                            <type>ClausiusClapeyron</type>\n";
     m << "<triple_temperature>" << T_triple << "</triple_temperature>\n";
     m << "<critical_temperature>" << T_critical << "</critical_temperature>\n";
@@ -105,7 +105,7 @@ std::array<double, 29> const ref_liquid_pressure = {
     1.50000E+05, 2.00000E+05, 5.00000E+05, 1.00000E+06, 5.00000E+06,
     1.01325E+05, 1.50000E+05, 2.00000E+05, 5.00000E+05};
 
-std::array<double, 29> const ref_vapor_pressure = {
+std::array<double, 29> const ref_vapour_pressure = {
     8.36218490000000E+02, 8.36218490000000E+02, 8.36218490000000E+02,
     8.36218490000000E+02, 8.36218490000000E+02, 9.35003929341767E+02,
     1.28489641893467E+03, 4.12252674333030E+03, 1.14370551053552E+04,
@@ -117,7 +117,7 @@ std::array<double, 29> const ref_vapor_pressure = {
     4.08809303341452E+05, 8.36218490000000E+02, 4.12894398711138E+03,
     1.82193325072170E+04, 6.28213193519972E+04};
 
-std::array<double, 29> const ref_d_vapor_pressure_dT = {
+std::array<double, 29> const ref_d_vapour_pressure_dT = {
     0.00000000000000E+00, 0.00000000000000E+00, 0.00000000000000E+00,
     0.00000000000000E+00, 5.48586853887215E+01, 6.05228838489413E+01,
     8.02335271069103E+01, 2.24315684282508E+02, 5.47138176563398E+02,
@@ -129,7 +129,7 @@ std::array<double, 29> const ref_d_vapor_pressure_dT = {
     1.08201481763584E+04, 0.00000000000000E+00, 2.24555657648407E+02,
     8.18907637521856E+02, 2.36684655384022E+03};
 
-std::array<double, 29> const ref_d_vapor_pressure_dp = {
+std::array<double, 29> const ref_d_vapour_pressure_dp = {
     0.00000000000000E+00,  0.00000000000000E+00,  0.00000000000000E+00,
     0.00000000000000E+00,  4.01150605544652E-05,  4.37340067538689E-05,
     5.60197502360705E-05,  1.31736092964623E-04,  2.48952060831370E-04,
@@ -171,25 +171,25 @@ TEST(MaterialPropertyLib, ClausiusClapeyron)
 
         auto const p_vap =
             gas_phase.component(0)
-                .property(MaterialPropertyLib::PropertyType::vapor_pressure)
+                .property(MaterialPropertyLib::PropertyType::vapour_pressure)
                 .template value<double>(variable_array, pos, t, dt);
 
         auto const d_p_vap_dT =
             gas_phase.component(0)
-                .property(MaterialPropertyLib::PropertyType::vapor_pressure)
+                .property(MaterialPropertyLib::PropertyType::vapour_pressure)
                 .template dValue<double>(
                     variable_array, MaterialPropertyLib::Variable::temperature,
                     pos, t, dt);
 
         auto const d_p_vap_dp =
             gas_phase.component(0)
-                .property(MaterialPropertyLib::PropertyType::vapor_pressure)
+                .property(MaterialPropertyLib::PropertyType::vapour_pressure)
                 .template dValue<double>(
                     variable_array,
                     MaterialPropertyLib::Variable::phase_pressure, pos, t, dt);
 
-        ASSERT_NEAR(p_vap, ref_vapor_pressure[i], 1.e-7);
-        ASSERT_NEAR(d_p_vap_dT, ref_d_vapor_pressure_dT[i], 1.e-7);
-        ASSERT_NEAR(d_p_vap_dp, ref_d_vapor_pressure_dp[i], 1.e-7);
+        ASSERT_NEAR(p_vap, ref_vapour_pressure[i], 1.e-7);
+        ASSERT_NEAR(d_p_vap_dT, ref_d_vapour_pressure_dT[i], 1.e-7);
+        ASSERT_NEAR(d_p_vap_dp, ref_d_vapour_pressure_dp[i], 1.e-7);
     }
 }