sentences: a phase change is a kind of physical change
docs: thaw is phase_change. phase_out is phase. vaporization is phase_change. freeze is phase_change. physical_state_change_event is reversible_process. physical_state_change_event is physical_transformation. physical_state_change_event is becoming. phase is point. physical_state_change_event is physical_creation_event. phase_change is natural_process.