**PART I FUNDAMENTAL FACTS AND DEFINITIONS **I. General Introduction

**PART I FUNDAMENTAL FACTS AND DEFINITIONS **I. General Introduction

II. Radiation at Thermodynamic Equilibrium. Kirchhoff's Law

Black RadiationPART II DEDUCTIONS FROM ELECTRODYNAMICS AND THERMODYNAMICSI. Maxwell's Radiation Pressure

II. Stefan-Boltzmann Law of Radiation

III. Wien's Displacement Law

IV. Radiation of Any Arbitrary Spectral Distribution of Energy. Entropy and Temperature of Monochromatic Radiation

V. Electrodynamical Processes in a Stationary Field of RadiationPART III ENTROPY AND PROBABILITYI. Fundamental Definitions and Laws. Hypothesis of Quanta

II. Ideal Monatomic Gases

III. Ideal Linear Oscillators

IV. Direct Calculation of the Entropy in The Case of Thermodynamic EquilibriumPART IV A SYSTEM OF OSCILLATORS IN A STATIONARY FIELD OF RADIATIONI. The Elementary Dynamical Law for The Vibrations of an Ideal Oscillator. Hypothesis of Emission of Quanta

II. Absorbed Energy

III. Emitted Energy. Stationary State

IV. The Law of the Normal Distribution Of Energy. Elementary Quanta Of Matter and ElectricityPART V IRREVERSIBLE RADIATION PROCESSES

I. Fields of Radiation in General

II. One Oscillator in the Field of Radiation

III. A System of Oscillators

IV. Conservation of Energy and Increase Of Entropy. Conclusion