Physics and chemistry both describe behavior of matter and its interaction with energy, but the two disciplines differ in their approach. In physics, it is typical to generalize matter to describe in detail and various scenarios the common properties of many different materials.[5][6] In optics for example, materials are described by their index of refraction which we may use to conclude, for instance, that materials with the same index of refraction have identical properties per our description. Chemistry, on the other hand, may describe the chemical composition of the sample to explore how change in the structure of molecules affects reactivity and their physical properties.[7]