Characteristic features of extended thermodynamics of dense gases

A recently-developed theory of extended thermodynamics of dense gasesis reviewed and its characteristic features are discussed. The discussion is made in the following four cases separately: (i) Rarefied monatomic gases, (ii) rarefied polyatomic gases, (iii) dense monatomic gases, and (iv) dense polyatomic gases. In particular, for rarefied polyatomic gases, we exemplify the validity of the theory through comparing the dispersion relation for sound with experimental data.