add: measurements

src/Measurements/Energy.cs

@@ -0,0 +1,15 @@
+namespace Hermeteus.Measurements;
+
+public static partial class Measurements
+{
+    public static double HeatCapacity(this HomogeneousMixture m)
+    {
+        H3 w = m.EigenState.Log().CayleyNegative().ConjugateOn(new DiagR3(0d, 0.5d, 1d));
+        return w.Rayleigh(m.EigenState.ColumnAverageBivariant);
+    }
+
+    public static double Phase(this HomogeneousMixture m) =>
+        throw new NotImplementedException();
+    
+}
+