Introduction; Basic probability concepts; Binomial, Gaussian and Poisson distributions; Statistical description of systems of particles; Interaction between macroscopic systems; Statistical thermodynamics; Macroscopic parameters and their measurements; Degeneracy function; Simple applications of macroscopic thermodynamics; Basic methods and results of statistical mechanics; Simple applications of statistical mechanics; Partition function and their properties; Ideal monatomic gas; The equipartition theorem; Paramagnetism; Kinetic theory of dilute gases in equilibrium; Equilibrium between phases or chemical species; Quantum statistics of ideal gases; Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac statistics; Ideal gas in the classical limit; Black body radiation; Conduction electrons in metals; Systems of interacting particles; Magnetism and low temperature.