The properties that you enter for a Solid are "passed through" the element and become outputs which you can then link to other elements.
You can save these results by clicking Final Values and/or Time Histories. Checking one of these causes all three outputs to be saved as results. If you wish to save only one or two of these as results, you can use the context menu of the output (accessed via a right-click) in the browser An alternative view of a GoldSim model, in which elements are displayed in a tree, and organized either hierarchically, or by type. to turn on or off one or more of the three outputs. In this case, the checkbox in the dialog will become gray (indicating that some of the results will be saved).
The display units The units (e.g., m, g, $/day) in which an output is displayed within GoldSim. for the outputs are specified immediately to the right of the input field (the Porosity, Tortuosity, Available Porosities and Relative Particulate Diffusivity are dimensionless, and hence do not have display units).