What topics did Wilhelm Ostwald explore as a philosopher of science?

Wilhelm Ostwald, a pioneering physical chemist, engaged deeply with the philosophy of science, exploring several key areas:12

• Energetics: Ostwald proposed a metaphysical interpretation of the world that asserted the primacy of energy over matter, arguing that matter is merely a manifestation of energy. This framework, which he called "energetics," opposed contemporary scientific materialism.1
• Positivism and Atomism: He adopted a form of positivism, rejecting theoretical concepts lacking empirical foundations. Consequently, he famously rejected atomism for roughly 15 years, engaging in intense debates with colleagues like Ludwig Boltzmann before accepting the atomic hypothesis in 1909.1
• Scientific Progress and Creativity: He was interested in the general laws governing scientific advancement, the psychological traits of prominent scientists, and the conditions necessary for scientific creativity.1
• Social and Ethical Applications: Ostwald extended his "energetic" principles to sociology, psychology, and ethics. He developed the "energetic imperative"—"Do not squander energy—utilize it!"—which drove his advocacy for educational reform, international peace, and the standardization of scientific documentation.1