Sublimation is a physical process where a substance changes directly from a solid to a gaseous state without passing through the liquid phase upon heating.

• Application: Useful for purifying solids that possess a high vapor pressure below their melting point.
• Examples: Naphthalene, Anthracene, Benzoic acid, Camphor, and Iodine.
• Non-sublimable solid impurities are left behind in the heating vessel, while the sublimed vapors are condensed back to pure solid on a cold surface.