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 automatically created when either the Reversible Reaction Group or the Equilibrium Reaction Group is added. The created species group node is coupled to the corresponding reaction group feature. If a reaction group feature is removed, disabled or enabled, the coupled species group feature will follow the same actions. The species in species group feature are only from its corresponding reaction group feature.

For the case of nonisothermal reactor conditions (Energy Balance is set to Include), a Species Thermodynamics subnode is automatically created in which the thermodynamic properties of the species can be specified.

The Show species name from CHEMKIN file checkbox is available when the coupled Reversible Reaction Group feature is used to import a CHEMKIN reaction system. With this checkbox selected, there will be an extra column, Name in CHEMKIN, in both the Property for Volumetric Species and Property for Surface Species tables. The Name in CHEMKIN column shows the original species names from the CHEMKIN file because the species names defined there can be modified to follow the naming rules in COMSOL.

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 checkbox under the Calculate Transport Properties is selected).