The direct transition of a solid to a vapour without passing through a liquid phase. Example: The transition of solid
CO2 to
CO2 vapour.
Source:
PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 591 (https://doi.org/10.1351/pac199466030577)