Why do scientists express atomic mass in atomic mass units?

Scientists express Atomic Mass in atomic mass units (amu) to provide a standardized way to compare the masses of atoms and molecules on a scale that is convenient for the size of subatomic particles. One atomic mass unit is defined as one twelfth of the mass of a carbon-12 atom, making it easier to express and calculate the relative masses of different elements. Using amu allows for clearer communication in scientific literature and simplifies calculations in chemistry and physics.