What is an AMU?

An AMU, or Atomic Mass Unit, is a tiny unit of measurement used to weigh the particles that make up atoms, like protons and neutrons. Think of it as a super small scale that scientists use to measure the weight of things that are way too tiny to see, even with a microscope! Just like you might use grams or ounces to weigh your snacks, scientists use AMUs to weigh the building blocks of everything in the universe.

One AMU is roughly equal to the mass of a single proton or neutron, which are the particles found in the nucleus (center) of an atom. Since atoms are incredibly small, AMUs are also really tiny, making them perfect for measuring the mass of these little particles.

Understanding AMUs helps scientists figure out how heavy different atoms are, which is important in chemistry and physics. For example, knowing the AMU of an element helps scientists predict how it will behave in different reactions and how it will combine with other elements to form new substances.