Molecular composition refers to the specific arrangement of atoms and molecules within a substance. This research area studies the types and quantities of various molecules present in a sample, as well as their interactions and relationships. By analyzing molecular composition, researchers can gain insights into the properties, behavior, and functions of different substances, which can be applied to various fields such as chemistry, biology, and materials science. Techniques used in this area include spectroscopy, mass spectrometry, and chromatography.