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Quantum physics, as a field within mechanics, delves into the behavior of matter and energy at extremely small scales, such as molecules, atoms, and even smaller particles like electrons, protons, and photons. It explores phenomena that defy classical intuition, including superposition (the idea that particles can exist in multiple states simultaneously) and entanglement (where particles become interconnected regardless of distance). Quantum physics thus forms a crucial foundation for technologies like lasers, semiconductors, and magnetic resonance imaging (MRI), and offers intriguing possibilities for future developments such as quantum computing. This subfield bridges the gap between mechanics and other scientific domains like mathematics and chemistry, while challenging our understanding of reality itself.