diff --git a/src/Mod/Fem/femguiutils/selection_widgets.py b/src/Mod/Fem/femguiutils/selection_widgets.py
index f423a19509..c7ae25c214 100644
--- a/src/Mod/Fem/femguiutils/selection_widgets.py
+++ b/src/Mod/Fem/femguiutils/selection_widgets.py
@@ -277,19 +277,21 @@ class GeometryElementsSelection(QtGui.QWidget):
         # label
         self._helpTextLbl = QtGui.QLabel()
         self._helpTextLbl.setWordWrap(True)
-        helpTextPart1 = self.tr('Click on "Add" and select geometric elements to add them to the list.')
-        helpTextPart2 = self.tr("The following geometry elements are allowed to select: ") + "<b>" + self.sel_elem_text + "</b>"
-        helpTextPart3 = self.tr("If no geometry is added to the list, all remaining ones are used.")
+        helpTextPart1 = self.tr(
+            'Click on "Add" and select geometric elements to add them to the list.{}'
+            "The following geometry elements are allowed to select: {}{}{}"
+            .format("<br>", "<b>", self.sel_elem_text, "</b>")
+        )
+        helpTextEmpty = self.tr(
+            "{}If no geometry is added to the list, all remaining ones are used.".format("<br>")
+        )
         if self.showHintEmptyList is True:
             self._helpTextLbl.setText(
-                helpTextPart1 + "<br>" +
-                helpTextPart2 + "<br>" +
-                helpTextPart3
+                helpTextPart1 + helpTextEmpty
             )
         else:
             self._helpTextLbl.setText(
-                helpTextPart1 + "<br>" +
-                helpTextPart2
+                helpTextPart1
             )
         # list
         self.list_References = QtGui.QListWidget()
@@ -310,13 +312,13 @@ class GeometryElementsSelection(QtGui.QWidget):
         mainLayout.addWidget(self.list_References)
 
         # if only "Solid" is avail, std-sel-mode is obsolete
-        if "Solid" in self.sel_elem_types and len (self.sel_elem_types) == 1:
+        if "Solid" in self.sel_elem_types and len(self.sel_elem_types) == 1:
             self.selection_mode_solid = True
         else:
             self.selection_mode_solid = False
 
         # show radio buttons, if a solid and at least one nonsolid is allowed
-        if "Solid" in self.sel_elem_types and len (self.sel_elem_types) > 1:
+        if "Solid" in self.sel_elem_types and len(self.sel_elem_types) > 1:
             self.rb_standard.setChecked(True)
             self.rb_solid.setChecked(False)
             mainLayout.addLayout(rbtnLayout)
diff --git a/src/Mod/Fem/femsolver/calculix/writer.py b/src/Mod/Fem/femsolver/calculix/writer.py
index 4cf3a3d3c9..7df2fca43d 100644
--- a/src/Mod/Fem/femsolver/calculix/writer.py
+++ b/src/Mod/Fem/femsolver/calculix/writer.py
@@ -1662,13 +1662,13 @@ class FemInputWriterCcx(writerbase.FemInputWriter):
             ccx_elset["ccx_mat_name"] = mat_obj.Material["Name"]
             self.ccx_elsets.append(ccx_elset)
 
-    def is_DENSITY_card_needed(self):
+    def is_density_needed(self):
         if self.analysis_type == "frequency":
             return True
-        if self.selfweight_objects:
-            return True
         if self.analysis_type == "thermomech" and not self.solver_obj.ThermoMechSteadyState:
             return True
+        if self.selfweight_objects:
+            return True
         return False
 
     def write_materials(self, f):
@@ -1676,7 +1676,7 @@ class FemInputWriterCcx(writerbase.FemInputWriter):
         f.write("** Materials\n")
         f.write("** written by {} function\n".format(sys._getframe().f_code.co_name))
         f.write("** Young\'s modulus unit is MPa = N/mm2\n")
-        if self.is_DENSITY_card_needed() is True:
+        if self.is_density_needed() is True:
             f.write("** Density\'s unit is t/mm^3\n")
         if self.analysis_type == "thermomech":
             f.write("** Thermal conductivity unit is kW/mm/K = t*mm/K*s^3\n")
@@ -1692,7 +1692,7 @@ class FemInputWriterCcx(writerbase.FemInputWriter):
                 YM = FreeCAD.Units.Quantity(mat_obj.Material["YoungsModulus"])
                 YM_in_MPa = float(YM.getValueAs("MPa"))
                 PR = float(mat_obj.Material["PoissonRatio"])
-            if self.is_DENSITY_card_needed() is True:
+            if self.is_density_needed() is True:
                 density = FreeCAD.Units.Quantity(mat_obj.Material["Density"])
                 density_in_tonne_per_mm3 = float(density.getValueAs("t/mm^3"))
             if self.analysis_type == "thermomech":
@@ -1717,7 +1717,7 @@ class FemInputWriterCcx(writerbase.FemInputWriter):
                 f.write("*ELASTIC\n")
                 f.write("{0:.0f}, {1:.3f}\n".format(YM_in_MPa, PR))
 
-            if self.is_DENSITY_card_needed() is True:
+            if self.is_density_needed() is True:
                 f.write("*DENSITY\n")
                 f.write("{0:.3e}\n".format(density_in_tonne_per_mm3))
             if self.analysis_type == "thermomech":