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Physical chemistry represents the branch of theoretical chemistry that applies fundamental principles of physics to understand macroscopic and microscopic chemical systems. It bridges the gap between atomic and molecular scales, making it an essential discipline within both chemistry and physics. Physical chemists strive to comprehend various phenomena such as chemical reactions, phase transitions, thermodynamics, and quantum mechanics in terms of physical laws. By doing so, they contribute significantly to numerous fields like materials science, catalysis, environmental science, and biochemistry, ultimately enriching our understanding of the natural world under the broader umbrellas of science and chemistry.