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This course of statistical physics is designed for undergraduate students in Physics department, School of Science at UR-CST. It starts with key reviews on the thermodynamcs and thermodynamic functions,
where through the use of Maxwell’s relations the Chemical potential is introduced. Then it moves to the basics of statistical approaches where the introduction of phase space, distribution functions
and microcanonical ensemble is introduced. Through the use of Lagrange multiplier, the derivation of Maxwell-Boltzmann distribution is done. After the introduction of probabulity, several systems are
considered like isolated systems with fixed (E, V, N ) known as Microcanonical Ensemble, Interacting systems with fixed (T, V, N ) known as canonical ensemble and finally interacting systems with fixed
(T, V, μ) known as Grand canonical ensemble. The applications of statistical physics are considered such as single-particle states, bosons, fermions, ideal fermions and boson gases and photon gases.