Physical Chemistry | Definition, Topics, & Facts | Britannica

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External Websites

• American Chemical Society - Physical Chemistry

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• physical chemistry - Student Encyclopedia (Ages 11 and up)

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physical chemistry, branch of chemistry concerned with interactions and transformations of materials. Unlike other branches, it deals with the principles of physics underlying all chemical interactions (e.g., gas laws), seeking to measure, correlate, and explain the quantitative aspects of reactions. Quantum mechanics has clarified much for physical chemistry by modeling the smallest particles ordinarily dealt with in the field, atoms and molecules, enabling theoretical chemists to use computers and sophisticated mathematical techniques to understand the chemical behaviour of matter. Chemical thermodynamics deals with the relationship between heat and other forms of chemical energy, kinetics with chemical reaction rates. Subdisciplines of physical chemistry include electrochemistry, photochemistry (see photochemical reaction), surface chemistry, and catalysis. (For a more in-depth discussion of physical chemistry, see chemistry: Physical chemistry.)

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.