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A phase diagrams is a type of graph used to show the equilibrium conditions between the thermodynamically-distinct phases; or to show what phases are present in the material system at various T, p, and compositions
Phase diagram is a graphical representation of all the equilibrium phases as a function of temperature, pressure, and composition. For one component systems, the equilibrium state of the system is defined by two independent parameters (P and T), (T and V), or (P and V).
Phase – a portion of a system that has uniform physical and chemical characteristics. Two distinct phases in a system have distinct physical and/or chemical characteristics (e.g. water and ice, water and oil) and are separated from each other by definite phase boundaries. A phase may contain one or more components.
A phase is a physically homogeneous state of matter with a given chemical composition and structure. the simplest examples are the three states of matter (solid, liquid, or gas) of a pure metal. the three phases of a pure metal have the same chemical composition, but each phase is obviously distinct physically due to differences in the bonding a...
In Sec. 8.1.7, the Gibbs phase rule for a pure substance was written 3 P . We now consider a system of more than one substance and more than one phase in an equilibrium state. The phase rule assumes the system is at thermal and mechanical equilibrium.
We see how to use phase diagrams to judge whether two substances are mutually miscible, whether an equilibrium can exist over a range of conditions, or whether the system must be brought to a definite pressure, temperature, and composition before equilibrium can be established.
• A phase: a homogeneous portion of a system that has uniform physical and chemical characteristics • Equilibrium: a system is at equilibrium if its free energy is
