版权所有：华东理工大学物理化学教研室 5 8.1 Definitions 1). The phase The number of phases in a system is denoted P. Ice is a single phase even though it might be chipped into small fragments. A crystal is a single phase. Two totally miscible liquids form a single phase. A gas, or a gaseous mixture, is a single phase. P = 1 Any sample cut from the sample, however small, is representative of the composition of the whole.版权所有：华东理工大学物理化学教研室 5 8.1 Definitions 1). The phase The number of phases in a system is denoted P. Ice is a single phase even though it might be chipped into small fragments. A crystal is a single phase. Two totally miscible liquids form a single phase. A gas, or a gaseous mixture, is a single phase. P = 1 Any sample cut from the sample, however small, is representative of the composition of the whole