What is sublimation ? Give name of sublimation substances.

Explanation

There are certain substances which normally pass from the solid to the vapour state directly and vice versa.
The change from solid state to vapour state without passing through the liquid state is called sublimation, and the substance is said to sublime.
Dry ice (solid `CO_(2)`) sublimes, so also iodine.
During the sublimation process both the solid and vapour states of a substance coexist in thermal equilibrium.