Answer:
Physical chemistry is the branch of chemistry concerned with the application of the techniques and theories of physics to the study of chemical systems.
Step-by-step explanation:
Physical chemistry is the the branch of the chemistry which uses and implement laws, theories and techniques of physics to in chemistry to study various processes taking place in chemistry such: Behavior of matter at atomic level in a molecule or how reaction occurs etc.
The common examples of this are thermodynamics and quantum mechanics.