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**Quick run-down**: I am attempting to model thin film materials (e.g. Ti-Al-N) for thermal analysis. I am

confused on how to figure out the number density of Nitrogen for a ceramic. All

the tables I have in school textbooks are for gas (~0.0013 g/cm3). I can find

density of nitrogen/oxygen in a solid state, but is this the correct density?**Question**: Is the density of the solid state the correct density to use for modelling ceramics? I realize

the structural differences, but not certain if the density can be estimated to be

the same.Any assistance will be much appreciated!