版权所有：华东理工大学物理化学教研室 5 1). The phase α ( phasewater ) β phase oil )( h ρ 6.1 The stabilities of phases-Basic concepts A phase of a substance is a form of matter that is uniform throughout in chemical composition and physical state.版权所有：华东理工大学物理化学教研室 5 1). The phase α ( phasewater ) β phase oil )( h ρ 6.1 The stabilities of phases-Basic concepts A phase of a substance is a form of matter that is uniform throughout in chemical composition and physical state