The Species Group node () contains information on a molecular level about the volumetric species and the surface species present in the model. The Property for Volumetric Species or Property for Surface Species tables typically collect parameters from when importing CHEMKIN transport files.

This node is also automatically added when either the Reversible Reaction Group or the Equilibrium Reaction Group are used.

For the case of temperature dependent reaction kinetics (Feature Nodes Available for the Chemistry Interface check box is selected), a Species Thermodynamics subnode is automatically created in which the thermodynamic properties of the species can be specified.

This section allows import of CHEMKIN transport files. To import the data directly into the table columns, click Browse to locate the CHEMKIN file to be imported, then click Import. Note that this section is only shown when transport properties are computed (Calculate mixture properties check box under the Calculate Transport Properties is selected).