Fix some ambiguity issues

UnitsNet.Tests/CustomCode/MassConcentrationTests.cs

@@ -131,7 +131,7 @@ public static void ComponentMassFromMassConcentrationAndSolutionVolume(
  var massConcentration = new MassConcentration(massConcValue, massConcUnit);
  var volume = new Volume(volumeValue, volumeUnit);
 
- Mass massComponent = massConcentration * volume;
+ Mass massComponent = (Density)massConcentration * volume;
 
  AssertEx.EqualTolerance(expectedMassValue, massComponent.As(expectedMassUnit), tolerance);
  }

UnitsNet/CustomCode/Quantities/MassConcentration.extra.cs

@@ -5,13 +5,29 @@ namespace UnitsNet
 {
  public partial struct MassConcentration
  {
+ /// <summary>
+ /// Because Density and MassConcentration are almost the same, we can convert between them.
+ /// </summary>
+ public static implicit operator MassConcentration(Density density)
+ {
+ return From(density.ToUnit(Density.BaseUnit).Value, BaseUnit);
+ }
+
+ /// <summary>
+ /// Because Density and MassConcentration are almost the same, we can convert between them.
+ /// </summary>
+ public static explicit operator Density(MassConcentration massConcentration)
+ {
+ return Density.From(massConcentration.ToUnit(BaseUnit).Value, Density.BaseUnit);
+ }
+
  /// <summary>
  /// Get <see cref="Molarity" /> from this <see cref="MassConcentration" /> using the known component <see cref="MolarMass" />.
  /// </summary>
  /// <param name="molecularWeight"></param>
  public Molarity ToMolarity(MolarMass molecularWeight)
  {
- return this / molecularWeight;
+ return (Density)this / molecularWeight;
  }
 
  /// <summary>
@@ -21,7 +37,7 @@ public Molarity ToMolarity(MolarMass molecularWeight)
  /// <returns></returns>
  public VolumeConcentration ToVolumeConcentration(Density componentDensity)
  {
- return this / componentDensity;
+ return VolumeConcentration.FromDecimalFractions((Density)this / componentDensity);
  }
 
  #region Static Methods

UnitsNet/CustomCode/Quantities/MassFraction.extra.cs

@@ -11,7 +11,7 @@ public partial struct MassFraction
  /// <returns>The actual mass of the component involved in this mixture</returns>
  public Mass GetComponentMass(Mass totalMass)
  {
- return totalMass * this;
+ return totalMass * DecimalFractions;
  }
 
  /// <summary>
@@ -21,7 +21,7 @@ public Mass GetComponentMass(Mass totalMass)
  /// <returns>The total mass of the mixture</returns>
  public Mass GetTotalMass(Mass componentMass)
  {
- return componentMass / this;
+ return componentMass / DecimalFractions;
  }
 
  #region Static Methods

UnitsNet/CustomCode/Quantities/Molarity.extra.cs

@@ -20,7 +20,7 @@ public MassConcentration ToMassConcentration(MolarMass molecularWeight)
  /// <param name="componentMass"></param>
  public VolumeConcentration ToVolumeConcentration(Density componentDensity, MolarMass componentMass)
  {
- return this * componentMass / componentDensity;
+ return VolumeConcentration.FromDecimalFractions(this * componentMass / componentDensity);
  }
 
  #region Static Methods

UnitsNet/CustomCode/Quantities/VolumeConcentration.extra.cs

@@ -43,7 +43,7 @@ public static VolumeConcentration FromVolumes(Volume componentVolume, Volume mix
  /// <param name="componentMolarMass"></param>
  public static VolumeConcentration FromMolarity(Molarity molarity, Density componentDensity, MolarMass componentMolarMass)
  {
- return molarity * componentMolarMass / componentDensity;
+ return FromDecimalFractions(molarity * componentMolarMass / componentDensity);
  }
 
  #endregion