Introduction to quantum mechanics

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Quantum mechanics (QM) is the study of matter and of matter's interactions with energy on the scale of atomic and subatomic particles. (By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon.) Classical physics is still used in much of modern science and technology. However, towards the end of the 19th century, scientists discovered phenomena in both the large (macro) and the small (micro) worlds that classical physics could not explain. The desire to resolve inconsistencies between observed phenomena and classical theory led to a revolution in physics, a shift in that science's original paradigm: the development of quantum mechanics. Many aspects of quantum mechanics yield unexpected results, defying expectations and appearing counterintuitive. These aspects can seem paradoxical as they map behaviors quite differently from those seen at larger scales. In the words of quantum...

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