Removes non-dimensionals when simplifying composite dimensions

Author: Maxcode123

src/property_utils/tests/units/test_descriptors.py

@@ -2542,6 +2542,14 @@ def test_same_denominator_dimensions(self):
     def test_same_numerator_dimensions_zero_sum(self):
         self.assert_result(" / C")
 
+    @args({"composite": CompositeDimension([dimension_9()], [dimension_9()])})
+    def test_non_dimensionals(self):
+        self.assert_result("")
+
+    @args({"composite": CompositeDimension([dimension_9(3)], [dimension_9()])})
+    def test_non_dimensionals_exponentiated(self):
+        self.assert_result("")
+
 
 @add_to(CompositeDimension_test_suite)
 class TestCompositeDimensionSimplified(TestCompositeDimensionSimplify):

src/property_utils/units/descriptors.py

@@ -1717,6 +1717,9 @@ def simplify(self) -> None:
         numerator = []
         denominator = []
         for unit, exponent in exponents.items():
+            if unit.is_non_dimensional():
+                continue  # do not add non dimensional units to the simplified composite
+
             if exponent > 0:
                 numerator.append(Dimension(unit) ** exponent)
             elif exponent < 0: