Stability, in the context of physical and chemical sciences, describes the resistance of a system, material, or chemical species to change. Chemical stability refers to the inherent propensity of a compound to maintain its structural and molecular integrity when subjected to varying conditions, such as temperature, pressure, or exposure to reactive elements. This concept is critical in pharmacology, where the shelf-life and efficacy of drug compounds depend on resisting degradation reactions. In physics, stability pertains to the tendency of a system to return to its initial equilibrium state following a small perturbation. Understanding the factors that govern stability is essential for developing resilient materials, reliable chemical processes, and safe therapeutic agents.