diff --git a/Elements.Quantity/Quantities/Basic/Density.cs b/Elements.Quantity/Quantities/Basic/Density.cs
new file mode 100644
index 0000000..6156588
--- /dev/null
+++ b/Elements.Quantity/Quantities/Basic/Density.cs
@@ -0,0 +1,71 @@
+using System;
+
+namespace Elements.Quantity
+{
+    public readonly struct Density : IQuantity<Density>
+    {
+        #region ESSENTIALS
+
+        public readonly double BaseValue;
+
+        double IQuantity.BaseValue => BaseValue;
+
+        public Density(double baseValue = 0) : this() { BaseValue = baseValue; }
+
+        public bool Equals(Density other) { return BaseValue == other.BaseValue; }
+        public int CompareTo(Density other) { return BaseValue.CompareTo(other.BaseValue); }
+
+        #endregion
+
+        #region QUANTITY NAME DEFINITIONS
+
+        public string[] GetShortBaseNames() { return new string[] { "kg/m³" }; }
+        public string[] GetLongBaseNames() { return new string[] { "kilograms per cubic meter", "kilogram per cubic meter" }; }
+
+        #endregion
+
+        #region UNITS
+
+        public Unit<Density> DefaultUnit { get { return KilogramPerCubicMeter; } }
+
+        public static readonly Unit<Density> KilogramPerCubicMeter = new Unit<Density>(1,
+            new UnitGroup[] { UnitGroup.Common },
+            new string[] { " kg/m³" }, new string[] { "kilograms per cubic meter" });
+
+        public static readonly Unit<Density> GramPerCubicCentimeter = new Unit<Density>(1000,
+            new UnitGroup[] { UnitGroup.Common },
+            new string[] { " g/cm³" }, new string[] { "grams per cubic centimeter" });
+
+        public static readonly Unit<Density> PoundPerCubicFoot = new Unit<Density>(16.0185,
+            new UnitGroup[] { UnitGroup.Imperial },
+            new string[] { " lb/ft³" }, new string[] { "pounds per cubic foot" });
+
+        #endregion
+
+        #region OPERATORS
+
+        public Density New(double baseVal) { return new Density(baseVal); }
+
+        public Density Add(Density q) { return new Density(BaseValue + q.BaseValue); }
+        public Density Subtract(Density q) { return new Density(BaseValue - q.BaseValue); }
+
+        public Density Multiply(double n) { return new Density(BaseValue * n); }
+        public Density Multiply(Density a, Ratio r) { return a * r.BaseValue; }
+        public Density Multiply(Ratio r, Density a) { return a * r.BaseValue; }
+
+        public Density Divide(double n) { return new Density(BaseValue / n); }
+        public Ratio Divide(Density q) { return new Ratio(BaseValue / q.BaseValue); }
+
+        public static Density Parse(string str) { return Unit<Density>.Parse(str); }
+        public static bool TryParse(string str, out Density q) { return Unit<Density>.TryParse(str, out q); }
+
+        public static Density operator +(Density a, Density b) { return a.Add(b); }
+        public static Density operator -(Density a, Density b) { return a.Subtract(b); }
+        public static Density operator *(Density a, double n) { return a.Multiply(n); }
+        public static Density operator /(Density a, double n) { return a.Divide(n); }
+        public static Ratio operator /(Density a, Density b) { return a.Divide(b); }
+        public static Density operator -(Density a) { return a.Multiply(-1); }
+
+        #endregion
+    }
+}
diff --git a/Elements.Quantity/Quantities/Basic/Luminance.cs b/Elements.Quantity/Quantities/Basic/Luminance.cs
new file mode 100644
index 0000000..4e9dace
--- /dev/null
+++ b/Elements.Quantity/Quantities/Basic/Luminance.cs
@@ -0,0 +1,67 @@
+using System;
+
+namespace Elements.Quantity
+{
+    public readonly struct Luminance : IQuantity<Luminance>
+    {
+        #region ESSENTIALS
+
+        public readonly double BaseValue;
+
+        double IQuantity.BaseValue => BaseValue;
+
+        public Luminance(double baseValue = 0) : this() { BaseValue = baseValue; }
+
+        public bool Equals(Luminance other) { return BaseValue == other.BaseValue; }
+        public int CompareTo(Luminance other) { return BaseValue.CompareTo(other.BaseValue); }
+
+        #endregion
+
+        #region QUANTITY NAME DEFINITIONS
+
+        public string[] GetShortBaseNames() { return new string[] { "cd/m²" }; }
+        public string[] GetLongBaseNames() { return new string[] { "candelas per square meter", "candela per square meter" }; }
+
+        #endregion
+
+        #region UNITS
+
+        public Unit<Luminance> DefaultUnit { get { return CandelaPerSquareMeter; } }
+
+        public static readonly Unit<Luminance> CandelaPerSquareMeter = new Unit<Luminance>(1,
+            new UnitGroup[] { UnitGroup.Common },
+            new string[] { " cd/m²" }, new string[] { "candelas per square meter" });
+
+        public static readonly Unit<Luminance> Nit = new Unit<Luminance>(1,
+            new UnitGroup[] { UnitGroup.Common },
+            new string[] { " nit" }, new string[] { "nits" }); // Nit is a non-SI name for cd/m²
+
+        #endregion
+
+        #region OPERATORS
+
+        public Luminance New(double baseVal) { return new Luminance(baseVal); }
+
+        public Luminance Add(Luminance q) { return new Luminance(BaseValue + q.BaseValue); }
+        public Luminance Subtract(Luminance q) { return new Luminance(BaseValue - q.BaseValue); }
+
+        public Luminance Multiply(double n) { return new Luminance(BaseValue * n); }
+        public Luminance Multiply(Luminance a, Ratio r) { return a * r.BaseValue; }
+        public Luminance Multiply(Ratio r, Luminance a) { return a * r.BaseValue; }
+
+        public Luminance Divide(double n) { return new Luminance(BaseValue / n); }
+        public Ratio Divide(Luminance q) { return new Ratio(BaseValue / q.BaseValue); }
+
+        public static Luminance Parse(string str) { return Unit<Luminance>.Parse(str); }
+        public static bool TryParse(string str, out Luminance q) { return Unit<Luminance>.TryParse(str, out q); }
+
+        public static Luminance operator +(Luminance a, Luminance b) { return a.Add(b); }
+        public static Luminance operator -(Luminance a, Luminance b) { return a.Subtract(b); }
+        public static Luminance operator *(Luminance a, double n) { return a.Multiply(n); }
+        public static Luminance operator /(Luminance a, double n) { return a.Divide(n); }
+        public static Ratio operator /(Luminance a, Luminance b) { return a.Divide(b); }
+        public static Luminance operator -(Luminance a) { return a.Multiply(-1); }
+
+        #endregion
+    }
+}
diff --git a/Elements.Quantity/Quantities/Basic/Torque.cs b/Elements.Quantity/Quantities/Basic/Torque.cs
new file mode 100644
index 0000000..aa54dc3
--- /dev/null
+++ b/Elements.Quantity/Quantities/Basic/Torque.cs
@@ -0,0 +1,67 @@
+using System;
+
+namespace Elements.Quantity
+{
+    public readonly struct Torque : IQuantity<Torque>
+    {
+        #region ESSENTIALS
+
+        public readonly double BaseValue;
+
+        double IQuantity.BaseValue => BaseValue;
+
+        public Torque(double baseValue = 0) : this() { BaseValue = baseValue; }
+
+        public bool Equals(Torque other) { return BaseValue == other.BaseValue; }
+        public int CompareTo(Torque other) { return BaseValue.CompareTo(other.BaseValue); }
+
+        #endregion
+
+        #region QUANTITY NAME DEFINITIONS
+
+        public string[] GetShortBaseNames() { return new string[] { "Nm" }; }
+        public string[] GetLongBaseNames() { return new string[] { "newton meters", "newton meter" }; }
+
+        #endregion
+
+        #region UNITS
+
+        public Unit<Torque> DefaultUnit { get { return NewtonMeter; } }
+
+        public static readonly Unit<Torque> NewtonMeter = new Unit<Torque>(1,
+            new UnitGroup[] { UnitGroup.Common },
+            new string[] { " Nm" }, new string[] { "newton meters" });
+
+        public static readonly Unit<Torque> PoundFoot = new Unit<Torque>(1.35582,
+            new UnitGroup[] { UnitGroup.Imperial },
+            new string[] { " lb·ft" }, new string[] { "pound-feet" });
+
+        #endregion
+
+        #region OPERATORS
+
+        public Torque New(double baseVal) { return new Torque(baseVal); }
+
+        public Torque Add(Torque q) { return new Torque(BaseValue + q.BaseValue); }
+        public Torque Subtract(Torque q) { return new Torque(BaseValue - q.BaseValue); }
+
+        public Torque Multiply(double n) { return new Torque(BaseValue * n); }
+        public Torque Multiply(Torque a, Ratio r) { return a * r.BaseValue; }
+        public Torque Multiply(Ratio r, Torque a) { return a * r.BaseValue; }
+
+        public Torque Divide(double n) { return new Torque(BaseValue / n); }
+        public Ratio Divide(Torque q) { return new Ratio(BaseValue / q.BaseValue); }
+
+        public static Torque Parse(string str) { return Unit<Torque>.Parse(str); }
+        public static bool TryParse(string str, out Torque q) { return Unit<Torque>.TryParse(str, out q); }
+
+        public static Torque operator +(Torque a, Torque b) { return a.Add(b); }
+        public static Torque operator -(Torque a, Torque b) { return a.Subtract(b); }
+        public static Torque operator *(Torque a, double n) { return a.Multiply(n); }
+        public static Torque operator /(Torque a, double n) { return a.Divide(n); }
+        public static Ratio operator /(Torque a, Torque b) { return a.Divide(b); }
+        public static Torque operator -(Torque a) { return a.Multiply(-1); }
+
+        #endregion
+    }
+}