Proprety of Nitrogen and Copper in Comsol

Hello family ;

 I find it difficult to define the parameters of nitrogen gas and solid copper 

For Nitrogen, I need;      - Electrical conductivity      - Total volumetric emission Coefficient

For the Cooper, I need;      - Ratio of specific heats      - Relative permittivity      - Total volumetric emission Coefficient

Help me please ! My greetings.