Hello, 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!