In the physical sciences, a phase is a region o space (a thermodynamic system), atouer whilk aw physical properties o a material is essentially uniform. Insaumples o physical properties include density, index o refraction, magnetization an chemical composeetion. A semple description is that a phase is a region o material that is chemically uniform, physically distinct, an (eften) mechanically separable. In a system consistin o ice an watter in a gless jaur, the ice cubes is ae phase, the watter is a seicont phase, an the humid air ower the watter is a third phase. The gless o the jaur is anither separate phase.
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