Complex sentence: The term "phase" is sometimes used as a synonym for state of matter.DOGDOGDOGDOG used to refer to a set of equilibrium states demarcated in terms of state variables such as pressure and temperature by a phase boundary on a phase diagram.
Split into simpler sentences: The term "phase" is sometimes used as a synonym for state of matter. Also, the term "phase" is sometimes used to refer to a set of equilibrium states demarcated in terms of state variables such as pressure and temperature by a phase boundary on a phase diagram.