Introduction S 7-1The concepts and fundamental postulate S 7-2Most probable distribution and Boltzmann distrebution S 7-3Expression of thermodynamic quantities in terms of the partition function S 7-4Evaluation of the partition function for the particle S 7-5Thermodynamic properties of perfect gases Introduction §7-1The concepts and fundamental postulate § 7-2Most probable distribution and Boltzmann distrebution § 7-3Expression of thermodynamic quantities in terms of the partition function § 7-4Evaluation of the partition function for the particle § 7-5Thermodynamic properties of perfect gases