How is "reactivity" defined in hazardous materials?

Reactivity is defined as the tendency of a substance to react chemically with other materials, which is essential in the study of hazardous materials. Understanding reactivity helps identify how a substance might behave under various conditions, including exposure to heat, pressure, or other chemicals. For instance, some chemicals can undergo violent reactions when mixed with certain substances, which can lead to explosions or the release of harmful gases. This knowledge is critical for safety in handling, storing, and transporting hazardous materials, ensuring that potential chemical interactions are carefully managed to prevent accidents or hazardous situations.

Other characteristics, such as freshness level, physical state, or the level of toxic fumes, do not directly relate to how a substance interacts chemically with its environment, making them less relevant to the concept of reactivity in the context of hazardous materials.