equilibrium phase diagram

An equilibrium phase diagram is a map that shows the stable forms of a material, like solid, liquid, or gas, under different conditions of temperature and pressure. It indicates which phases coexist at balance, meaning no change occurs over time. For example, it can show the temperature and pressure at which ice melts or water boils. These diagrams help scientists and engineers predict material behavior, design processes, and control properties in manufacturing, by understanding how materials change phases under varying conditions.