Definition: Quantum mechanics is a branch of physics that studies matter, energy, and how they interact at a microscopic level. It has been revolutionized by the discovery of quantum superposition and quantum entanglement, which are two phenomena that allow particles to be in multiple places simultaneously. In the classical limit, where all the particles are perfectly isolated from each other and not interacting with anything else, quantum mechanics allows for the description of behavior at very small scales. It is based on the idea that objects can exist in states with equal probabilities, even if they have no definite shape or size. This leads to a variety of phenomena, such as superpositions, entanglement, and the wave nature of matter. The word "quantum mechanics" was first used by the German physicist Niels Bohr in 1926 for the theoretical description of these phenomena. In more recent times, it has been applied to describe the behavior of many-body systems at even smaller scales, such as those in atomic and molecular physics. Quantum mechanics is one of the most important areas of physics, as it has profound implications for our understanding of the universe and its laws. It is also used in a variety of fields, including materials science, chemistry, quantum computing, and quantum cryptography.
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