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Quantum Mechanics is the branch of physics dealing with phenomena on extremely small scales, such as molecules, atoms, and subatomic particles. It introduces unique concepts that challenge classical physics, like wave-particle duality and superposition. Quantum mechanics also forms the basis for quantum field theory, which studies the behavior of particles in particle physics, a subfield of mathematics within science. Here, it provides explanations for phenomena involving fundamental particles, their properties, and interactions. The principles underlying quantum mechanics enable technologies like lasers and semiconductors, transforming modern life. Quantum Mechanics is an integral part of the Science/Mathematics/Particle Physics hierarchy, delving into the intricacies of particle behavior governed by mathematical equations that transcend everyday experiences.