The branch of chemistry dealing with the physical properties of chemical substances WordNet 3.0 & Open English WordNet

Physical chemistry is the study of macroscopic and microscopic phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibria. Wikipedia

Study of macroscopic, atomic, subatomic, and particulate phenomena in chemical systems in terms of laws and concepts of physics Wikidata

A science dealing with the effects of physical phenomena on chemical properties. OmegaWiki

The science that uses theories and techniques from physics to study chemical systems. Wiktionary

The chemistry subdiscipline. Wiktionary (translation)