Answer
Quantum Mechanics is not one of Ostwald's areas of contribution. Ostwald was a German chemist and philosopher, renowned for his contributions in physical and theoretical chemistry. His notable works include the development of the Ostwald process for nitric acid production, the law of dilution, and the concept of chemical affinity. Ostwald's expertise primarily revolved around chemistry, thermodynamics, and scientific philosophy, while Quantum Mechanics falls within the realm of physics.