Chemical composition refers to the arrangement, type, and ratio of atoms in a substance. This field of research focuses on studying the elements that make up a material and understanding how they interact with each other on a molecular level. By analyzing the chemical composition of a substance, researchers can determine its properties, behavior, and potential uses in various industries such as pharmaceuticals, materials science, and environmental science. Techniques such as spectroscopy, chromatography, and mass spectrometry are commonly used to analyze and study the chemical composition of materials.