Additional to the always existing layer of goods it is possible to create various layers of substances (or subgoods) and/or an energy layer.
Here you find information about the following topics:
A selection of predefined substances (from the table of elements) and energy is available. You can customize this selection with your own entries (e.g. to define compounds or subgoods).
Choose which substances you want to consider in your substance flow analysis.
Select the layer for which you want to enter data or show the results.
Sometimes it is reasonable to use subgoods instead of substances. Working with subgoods, we assume to consider ALL of the subgoods assembling the goods used in a modell. So for each flow in a model, the sum of the mass flows of all subgood layers must be equal to the mass flow on the layer of goods. Note that this is not the case when working with substances because normally we select only a few substances of interest contained in the goods of a model. So for each flow, the sum of the mass flows of all substance layers is smaller than (or equal to) the mass flow on the layer of goods.