190 A phase may be defined as a homogeneous portion of a system that has uniform physical and chemical characteristics. A phase can consider to be a pure material,but a pure material may contain two or phases. Monophase system “homogeneous'” Multiphase system "heterogeneous"or "mixture" SINO-ITALIAN CAMPUSSINO-ITALIAN CAMPUS A phase may be defined as a homogeneous portion of a system that has uniform physical and chemical characteristics. Monophase system “homogeneous” Multiphase system “heterogeneous” or “mixture” A phase can consider to be a pure material, but a pure material may contain two or phases