In Fullmetal Alchemist: Brotherhood, the practice of alchemy stands at the pinnacle of science. It allows its practitioners to alter the composition of matter through the process of transmutation, a skill that is useful both in combat and everyday life. Despite its many uses though, alchemy is a science, and as such is subject to the laws of the FMA universe.
Source：https://www.cbr.com/fullmetal-alchemist-the-law-of-equivalent-exchange-explained/
