/// <summary>
/// Computes the partial pressure of a specified substance in the volume above a specified mixture at a specified temperature.
/// Note that we will ignore the temperature of the mixture.
/// </summary>
/// <param name="substance">The substance whose partial pressure we desire.</param>
/// <param name="temperature">The temperature at which we wish to have the partial pressure computed, in degrees kelvin.</param>
/// <param name="mixture">The mixture that specifies the other materials that are to be considered in the calculation.</param>
/// <returns>The partial pressure of the specified substance in the volume above the specified mixture, in Pascals.</returns>
private static double PartialPressure(Substance substance, double temperature, Mixture mixture)
{
MaterialType mt = substance.MaterialType;
if (mt.STPState == MaterialState.Unknown || mt.STPState == MaterialState.Liquid)
{
double molWt = mt.MolecularWeight;
double molFrac = mixture.GetMoleFraction(mt, MaterialType.FilterAcceptLiquidOnly);
double vaporPressure = ComputeVaporPressure(mt, temperature, TemperatureUnits.Kelvin, PressureUnits.Pascals);
return(molFrac * vaporPressure);
}
else
{
return(0.0);
}
}