2.1.4 Phase The uniform part of a system that has the same physical and chemical property and can be distinguished from the other part by a clear boundary. Homogeneous system(均相系统) Heterogeneous system(多相系统) 2.1.4 Phase Homogeneous system(均相系统) Heterogeneous system(多相系统) The uniform part of a system that has the same physical and chemical property and can be distinguished from the other part by a clear boundary