Surface Reactions and Physical Properties for Solid/Site Species

What are the surface reactions and physical properties necessary for solid/site species?

If there is a surface reaction, it may have been included site species (Site Species) while solid species (Solid Species) is in the reactants and products. For a site species and solid species, we will explain what kind of property values are necessary to the
actual calculation.
1. Physical properties of the site species and solid species must be defined as a fluid.
2. In the flow calculation, density is not dependent on the properties of site species and solid species. So is the case with viscosity and diffusivity.
3. In the calculation of heat transfer, enthalpy is not associated with the site species and solid species density and thermal conductivity, but it is related to the specific heat. In a normal surface reaction, there is a case that heat is ignored.
4. If the heat transfer is taken into account, by the definition of the density of the mixture, the flow may also be affected by the temperature distribution. In other words, the flow might be indirectly affected by the specific heat of site species and solid species.
5. If you do not have a reversible reaction, standard state entropy is not required for the site species and solid species.
6. The reactions including solid species are usually irreversible.