Ammonium Chloride Sublimation Experiment - Lab Setup & Process #180141 (License: Personal Use)

This labeled diagram illustrates the sublimation of ammonium chloride in a controlled laboratory setup. When heated in a china dish by a burner, solid ammonium chloride turns directly into vapor without passing through a liquid phase; the vapor then rises, contacts the cooler inner surface of the inverted funnel, and re-solidifies as crystalline deposits. A cotton plug at the top prevents vapor escape and contamination.

Used in high school or undergraduate chemistry curricula to demonstrate phase transitions, particularly sublimation. It supports lesson plans on states of matter, purification techniques, and reversible physical changes. Teachers and students search for this image to understand or illustrate the experimental procedure visually.