Chemistry is a basic natural science that studies the composition, structure, properties, transformation and application of substances at the atomic and molecular levels. It originates from life and production practice, and develops with the progress of human society.
Different from the smaller particle physics and nuclear physics, chemistry studies the material structure of atoms, molecules and ions (groups) and the interaction between chemical bonds and intermolecular forces.
Its scale is the closest to the macro in the micro world, so their natural laws are closely related to the physical and chemical properties of substances and materials in the macro world of human life. As an important bridge between the micro and macro material world, chemistry is one of the main ways and means for human beings to understand and transform the material world.