The editing dialog for a Fluid is shown below:
The dialog is identical to that of the Reference Fluid with one exception: you have a choice of either defining solubilities or partition coefficients (for the Reference Fluid you can only specify solubilities).
In most cases, you will want to define partition coefficients (rather than solubilities) for the Fluid (and this is the default). Partition coefficients determine how species partition between the Fluid and the Reference Fluid. By definition, the solubility in the Reference Fluid, along with the partition coefficients for the Fluid relative to the Reference Fluid, automatically determine the saturation concentration in the Fluid when the solubility limit for a system containing the Fluid is reached.
In some cases, you may want to create new Fluids in which you define solubilities for the Fluids. In this case, GoldSim automatically computes the partition coefficients for the Fluid with respect to the Reference Fluid. (By definition, the partition coefficient for a species is simply the ratio of the solubility in the Fluid to the solubility in the Reference Fluid).
Learn more about: