substance identity

Substance identity refers to the specific characteristics that define a chemical substance, making it unique and distinguishable from others. It includes properties like its molecular structure, composition, and physical attributes. In science and testing, establishing substance identity ensures that the material is correctly identified and consistent across different samples or experiments. This is crucial for safety, quality control, and regulatory compliance. Essentially, it's about confirming exactly what a substance is at the chemical level, so everyone understands and agrees on its nature.