Thermal stability refers to the ability of a substance to maintain its physical and chemical properties when exposed to changes in temperature. Materials with high thermal stability can withstand heat without undergoing significant degradation, decomposition, or phase changes. This property is crucial in various applications, such as in the design of aerospace components and electronic devices, where temperature fluctuations can occur. In chemistry, thermal stability is often assessed by measuring the temperature at which a compound begins to break down. For example, polymers with high thermal stability are used in high-temperature environments, while metals may require specific treatments to enhance their stability. Understanding thermal stability helps in selecting appropriate materials for specific conditions.