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Physical chemistry is the branch of chemistry that employs and applies principles from physics in order to understand chemical systems and processes. It studies macroscopic properties, such as temperature and pressure, and microscopic phenomena, like chemical reactions and particle interactions. This subcategory under general chemistry explores the fundamental laws governing matter and energy at the atomic and molecular scale, which are essential to understanding a wide range of chemical behaviors and technologies. Physical chemistry encompasses various sub-disciplines, including thermodynamics, quantum mechanics, statistical mechanics, and electrochemistry, providing a comprehensive framework for describing and predicting chemical systems' behavior under different conditions.