in: a substance
is: a change in bulk properties which, for pure substances, is often found to occur within a vanishingly small range of temperature. [P7.4]
is exemplified: by the melting of a solid to form a liquid. [P7.1, P7.4]
is also exemplified: by changes in the crystalline structure of solids. [P7.4]
is accompanied: in some phase transitions, including the solid-liquid-vapour ones, by latent heats (but this is not true of all phase transitions). [P7.4]
See fusion, sublimation, vaporization.
Copyright 1997, The Open University