Added thermal conductivity

test/unit_test/runtime/fmt_units_test.cpp

@@ -268,6 +268,12 @@ TEST_CASE("fmt::format on synthesized unit symbols", "[text][fmt]")
     CHECK(fmt::format("{:%Q %Aq}", 1q_J_per_kg_K) == "1 J K^-1 kg^-1");
   }
 
+  SECTION("thermal conductivity")
+  {
+    CHECK(fmt::format("{}", 1q_W_per_m_K) == "1 W ⋅ m⁻¹ ⋅ K⁻¹");
+    CHECK(fmt::format("{:%Q %Aq}", 1q_W_per_m_K) == "1 W m^-1 K^-1");
+  }
+
   SECTION("incoherent units with powers")
   {
     CHECK(fmt::format("{}", 1q_mi * 1q_mi * 1q_mi) == "1 [15900351812136/3814697265625 × 10⁹] m³");