<P> In the physical sciences , a phase is a region of space ( a thermodynamic system ) , throughout which all physical properties of a material are essentially uniform . Examples of physical properties include density , index of refraction , magnetization and chemical composition . A simple description is that a phase is a region of material that is chemically uniform , physically distinct , and ( often ) mechanically separable . In a system consisting of ice and water in a glass jar , the ice cubes are one phase , the water is a second phase , and the humid air over the water is a third phase . The glass of the jar is another separate phase . ( See state of matter # Glass ) </P>
<P> In the physical sciences , a phase is a region of space ( a thermodynamic system ) , throughout which all physical properties of a material are essentially uniform . Examples of physical properties include density , index of refraction , magnetization and chemical composition . A simple description is that a phase is a region of material that is chemically uniform , physically distinct , and ( often ) mechanically separable . In a system consisting of ice and water in a glass jar , the ice cubes are one phase , the water is a second phase , and the humid air over the water is a third phase . The glass of the jar is another separate phase . ( See state of matter # Glass ) </P>
what is any part of a system with uniform composition and properties
what is any part of a system with uniform composition and properties
phase
phase