diff --git a/include/scalr/named_quantity/volume.hpp b/include/scalr/named_quantity/volume.hpp
index 62cd07a..6a8539f 100644
--- a/include/scalr/named_quantity/volume.hpp
+++ b/include/scalr/named_quantity/volume.hpp
@@ -50,12 +50,12 @@ struct cubic_meters {
 
 struct liters {
   using dimension = volume_dimension;
-  using ratio = std::ratio<100>;
+  using ratio = std::milli;
 };
 
 struct milliliters {
   using dimension = volume_dimension;
-  using ratio = std::ratio<10000>;
+  using ratio = std::micro;
 };
 
 template <typename Ratio>
@@ -69,20 +69,20 @@ struct make<volume_dimension, std::ratio<1>> {
 };
 
 template <>
-struct make<volume_dimension, std::ratio<1, 1000>> {
+struct make<volume_dimension, std::milli> {
   using type = liters;
 };
 
 template <>
-struct make<volume_dimension, std::ratio<1, 1000000>> {
+struct make<volume_dimension, std::micro> {
   using type = milliliters;
 };
 
 }  // namespace unit
 
 using cubic_meters = volume<double, std::ratio<1>>;
-using liters = volume<double, std::ratio<1, 1000>>;
-using milliliters = volume<double, std::ratio<1, 1000000>>;
+using liters = volume<double, std::milli>;
+using milliliters = volume<double, std::micro>;
 
 namespace literals {
 
diff --git a/tests/scalr_core.test.cpp b/tests/scalr_core.test.cpp
index 481fe5f..34d5ec2 100644
--- a/tests/scalr_core.test.cpp
+++ b/tests/scalr_core.test.cpp
@@ -230,6 +230,12 @@ TEST_CASE("Named Quantities") {
     CHECK(80_kg * 9.81_mps2 * 3_m / 5_s == 470.88_W);
   }
 
+  SECTION("Volume") {
+    CHECK(1_l == 1000_ml);
+    CHECK(1000_l == 1_m3);
+    CHECK(0.5_l + 250_ml == 0.75_l);
+  }
+
   SECTION("Quantity Conversion") {
     scalr::seconds secs{12};
     scalr::minutes mins{4};