In the research area of internal structure, scientists study the composition, organization, and arrangement of materials at a microscopic level. This can include the analysis of the internal structure of various substances such as metals, alloys, polymers, crystals, and biological tissues. Researchers in this field use a variety of techniques such as microscopy, X-ray diffraction, spectroscopy, and computer modeling to investigate the internal structure of materials and understand how it affects their properties and behavior. By studying internal structure, scientists can gain insights into the fundamental processes that govern the properties and performance of materials, leading to advancements in a wide range of industries including manufacturing, electronics, and healthcare.