Answer:
The process in which a solid changes directly into gaseous form, without transcurring to the "intermediate-form" which would be the liquid form.
Explanation:
Some elements or substances can go directly from solid to gaseous form, and that process is called sublimation.
A common example of sublimation would be the sublimation of dry-ice, which is solid . When the temperature of the dry ice reaches -78.5 ºC or higher, it will start becoming a gas.
Remember:
Solid → gas = sublimation
Solid → liquid = fusion
Gas → liquid = condensation
Gas → solid = deposition
Liquid → gas = evaporation
Liquid → solid = solidification
Hope it helped,
BiologiaMagister