Thermodynamics and Statistical Mechanics deals with the said subject in its totality. The term thermodynamics should have been reserved for irreversible thermomechanics, which, if we consider situations not too far from equilibrium, would be termed first-order thermomechanics, with higher-order versions of our science reserved for increasingly difficult cases. The quantum theory has many mathematical approaches, but the philosophy is essentially the same. Quantum mechanics is the foundation of chemistry, because it deals with subatomic particles, as well as atoms, molecules, elements, compounds, and much larger systems. At the subatomic scale, there is no boundary between particles and waves. In fact, both particles and wave properties must be considered simultaneously for a system. The study of quantum mechanics lead us to understand the material and the universe beyond the general perception of matter by our ordinary senses of tasting, seeing, hearing, feeling, and sensing. The book will prove valuable for those with backgrounds in physics and applied mathematics who desire an introduction to the subject.