Sublimation is the conversion of a:
It is possible for some solids to change directly to a vapor by a process called sublimation as seen in dry ice; this, however, has no practical importance as far as dental materials are concerned.
Sublimation is the conversion of a solid directly to gas.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 18
Solid directly to gas
Gas to liquid and then to solid
Gas directly to liquid
Solid to liquid and then to gas