phase changes change the arrangement of molecules in a substance / in a sample
vaporization is not phase_change. phase_in is phase. batch_diffusion is not thermal_lot_modification. phase_change is not natural_process. liquefaction is not phase_change. batch_diffusion is thermal_lot_modification. vaporization is phase_change. phase_change is natural_process. phase is state_of_matter. liquefaction is phase_change.