BuildingSystems.Media.Specialized.Water.TemperatureDependentDensity.density_derX

# .BuildingSystems.Media.Specialized.Water.TemperatureDependentDensity.density_derX

Return the partial derivative of density with respect to mass fractions at constant pressure and temperature

## Information

This function returns the partial derivative of density with respect to mass fraction, which is zero as the medium is a single substance.

## Revisions

- December 18, 2013, by Michael Wetter:
  First implementation.

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