The dialogs used to edit the properties of, and relations between, species are grouped into the Physical Properties submenu in the UTCHEM menu. They include:
Phase Behavior
Interfacial Tension
Organic Mass Transfer
Relative Permeability
Viscosity
Component Density
Fluid Compressibility
Capillary Pressure
Diffusion and Dispersion
Adsorption
Tracer Properties
For additional information, see the UTCHEM documentation.