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This is a book about statistical mechanics at the advanced undergraduate level. It assumes a background in classical mechanics through the concept of phase space, in quantum mechanics through the Pauli exclusion principle, and in mathematics through multivariate calculus.

• ## 5: Classical Ideal Gases

This chapter considers ideal (i.e. non-interacting) gases made up of atoms or molecules that may have internal structure (i.e. not point particles). The internal degrees of freedom will be treated either classically or quantally, but the translational degrees of freedom will always be treated classically.