BuildSysPro.IBPSA.Media.Air.density_derX

# .BuildSysPro.IBPSA.Media.Air.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. This value is zero because in this medium, density is proportional to pressure, but independent of the species concentration.

## Revisions

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

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