A phase is a homogeneous part of a mixture distinguished from other parts by boundaries. A mixture of ice and water has two phases. A mixture of ice crystals and salt crystals also has two phases. A solution of salt in water is a single phase.

A phase change is the metamorphosis of a material or mixture from one phase to another. If the state of matter is changed, as in a liquid to a gas, it is called a change of state. Also called phase shift.

Facts on File Dictionary of Physics, p149, and McGraw-Hill Dictionary of Physics, p 425.

Change of state

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